The Office-Conversion Data Room: One Set of Evidence, Three Audiences (2026)

Last updated: July 2026

Quick answer: An office-to-residential conversion is not bought on square feet — it's bought on evidence: feasibility (do the floor plates pencil under light-and-air rules), entitlement (is it as-of-right or does it need a rezoning), environmental (asbestos and vapor intrusion), tenancy (can you deliver vacant possession), and basis (is your all-in cost below replacement). The defining feature of a conversion is that the sponsor needs the same evidence room three times — to buy the asset (or the note), to raise the LP equity, and to close the construction lender — and if those three packages ever disagree, the deal wobbles. So the 2026 playbook is: build the room once as the single source of truth, then run three permission lanes off it. The market is why this is live at scale — RentCafe/Yardi counts roughly 90,300 apartments in the 2026 office-to-apartment pipeline (up 28% year over year), office CMBS delinquency sits near 11.57% (off a record 12.34% in January 2026), and distressed towers are trading through the debt. When the same feasibility, entitlement, and basis evidence has to satisfy a seller, a room full of LPs, and a construction lender, that room is usually a commercial real estate data room — not email.

I'm Sean Yu, co-founder of Peony, a data room company serving 6,800+ customers across M&A, fundraising, and real estate. I don't sponsor conversions for a living — but I've watched a lot of CRE deals move through data rooms, and a conversion doesn't behave like a stabilized acquisition. In a normal purchase you're valuing an income stream that already exists; in a conversion you're valuing a thesis — that you can turn a half-empty office tower into apartments at a basis that beats building new — and a thesis only becomes financeable when the evidence behind it is organized, permissioned, and consistent everywhere it's read. That's the thesis of this post: the sponsor needs the same evidence room three times — to buy the asset or the note, to raise the equity, and to close the construction lender. Build it once and the number in the LP model is the number in the lender package is the number in the appraisal; build three separate email threads and you'll ship an LP deck that contradicts the lender package.

Here's the carve-out, because Peony has a family of CRE guides and this one owns a specific lane. If your entry is through the debt rather than the fee, read note sale data room — buying the paper (the collateral file, the chain of title) is how conversion buyers often take control before this room begins. If you're buying stabilized apartments where the income already exists, that's multifamily acquisition data room — the rent roll is the asset there, not a feasibility thesis. For the generic CRE process and clock, read commercial property due diligence; for provider selection across real estate, data room for real estate; and if you're raising a fund to do conversions rather than syndicating one deal, real estate fund data room. None of those own the conversion evidence axis — feasibility, entitlement, environmental, tenancy, basis, shown three times.

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Why is an office conversion bought on evidence instead of square feet?

Because there's no in-place income to value — you're underwriting a thesis, and a thesis is only worth what the evidence behind it can prove. A stabilized apartment building sells on a rent roll that already exists. A half-empty 1980s office tower sells on a chain of assumptions: that the floor plates convert to apartments, that the zoning allows it, that the environmental is manageable, that the remaining tenants can be cleared, and that your all-in basis lands below what it would cost to build the same units new. Every one of those assumptions is a document — or it's a hope, and lenders don't fund hopes.

The market in 2026 is why this is a live question at scale. Adaptive reuse has become a real asset class: RentCafe (Yardi) counts roughly 90,300 apartments planned via office-to-apartment conversion nationwide in 2026 — up 28% from 70,600 a year earlier and nearly four times the 2022 level — with office now the single largest source of adaptive-reuse units at 47% of the pipeline (about 90,300 of 193,900 planned units), per RentCafe's methodology. The distress feeding it is concentrated: office CMBS delinquency was near 11.57% in June 2026 (up 4 basis points on the month), still the most-troubled major property type and near its record. That record was 12.34% in January 2026 — so office peaked at 12.34% and has eased only slightly; it is not "falling sharply," and you should never present the 12.34% peak as the current number.

Separately, a wall of maturing debt keeps supplying candidates. On a CMBS-specific basis, roughly $76.6 billion of CMBS hard maturities come due in 2026, with office and retail the largest slices. On a broader all-lender basis, analysts have cited roughly $148 billion of office CRE debt maturing in 2026 — a different and larger scope that shouldn't be merged with the CMBS figure. Both point the same direction: loans written at 3-4% can't always refinance today, owners hand back keys, and the asset trades — often through the debt — to someone with a conversion thesis.

So the room's job isn't to prove the building is pretty. It's to prove the evidence — feasibility, entitlement, environmental, tenancy, basis — and to do it three times without the three packages ever disagreeing. That's the spine the index is built on.

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What does the 1740 Broadway deal show about the three-audience arc?

It shows the whole arc in one building: note purchase to basis reset to LP equity to construction loan — the same evidence room reused at each stage. 1740 Broadway (the former MONY Building) in Manhattan is the cleanest public illustration of why a conversion sponsor builds one room and shows it three times.

Trace it:

• Basis at the top of the cycle. Blackstone bought 1740 Broadway for $605 million in late 2014, then defaulted on the CMBS loan and handed back the keys in March 2022 — the office-distress story in miniature.
• Entry through the debt. In April 2024, Yellowstone Real Estate Investments acquired the building for roughly $185-200 million by buying Blackstone's debt/loan position — a note/loan-to-own entry, not a clean fee purchase. That's the basis reset: from $605 million (2014) to roughly $185 million (2024). The acquisition case is written in that number.
• The construction close. On June 18, 2026, Yellowstone closed a $480 million construction loan from Madison Realty Capital to fund a conversion into roughly 420 units (about 238 rental apartments plus 182 luxury condos; The Real Deal reported it as "422-unit").

Between the April 2024 basis reset and the June 2026 construction close sits the part that doesn't make the headline: the LP equity raise, and the underwriting that made both the equity and the loan financeable. The feasibility (do these plates convert), the entitlement (what's the residential path), the environmental, the tenancy, and the basis case — that evidence had to satisfy the acquisition underwriting, then the equity, then a $480 million construction lender. Same room, three audiences. 1740 Broadway is the institutional version of what a first-time sponsor does on a 240,000-square-foot tower: prove the thesis once, show it three times. The rest of this post is how you build that room.

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How do you take control of a distressed office tower — the fee or the note?

Control comes one of two ways — buy the fee from the owner or buy the loan and take title through the enforcement path — and for distressed office the debt is frequently the cleaner route. The two questions below are the ones first-time sponsors ask first.

Should I buy the CMBS note or the fee to control a distressed office tower?

It depends on who holds the building and how motivated they are, but for a distressed office tower the note is often the cleaner path to control — which is why so many conversion buyers go through the debt. If a solvent owner will sell the fee at a basis that pencils, buy the fee: it's a normal purchase-and-sale and you skip foreclosure. But distressed office is frequently owned by an out-of-the-money special-purpose entity with little reason to sign a clean deal, while the loan sits with a special servicer. Buying the note (a loan-to-own play) lets you set the discounted basis at the loan level, then take title through deed-in-lieu or foreclosure and wipe the existing cap stack. That's the arc at 1740 Broadway in Manhattan: Yellowstone bought Blackstone's debt position for roughly $185-200 million in April 2024 — not a clean fee purchase — then controlled the asset and, in June 2026, closed a $480 million construction loan. The trade-off is time and legal risk: a note buyer inherits an enforcement path a fee buyer skips. Either way the underwriting is the same evidence — feasibility, entitlement, environmental, tenancy, basis. Peony holds, permissions, watermarks, and logs that evidence; it does not opine on the foreclosure path.

The choice comes down to control and basis. A note buyer controls the timeline and the number; a fee buyer controls nothing until an out-of-the-money owner agrees to sign. When the fee owner is a defaulted SPE, the note is frequently the only path to a basis that lets the conversion pencil — see note sale data room for how that debt-axis room is organized.

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How does buying the note from a special servicer actually work?

You identify the loan, get access to the loan file under NDA, price it against your recovery case, and negotiate a loan sale with the servicer — then take title through the enforcement path. In a securitized (CMBS) loan, the special servicer directs the workout on behalf of the trust, generally subject to the controlling holder (typically the holder of the most-junior still-in-the-money tranche). A whole-loan or note purchase transfers the lender's right, title, and interest in the loan — the note, the mortgage, the assignment chain, the guaranty — after which your remedies are the ones written into the loan documents and state law: foreclosure (judicial or non-judicial depending on the state) or a negotiated deed-in-lieu. Timeline realities matter: a deed-in-lieu can be fast if the borrower cooperates and there are no junior liens or bankruptcy risk, while a contested judicial foreclosure can run months to years. Because you're buying paper, the room at this stage is a note file, not a property file — the note, endorsements, recorded assignments, title policy, and servicing history that prove you can enforce. Our note sale data room guide covers that debt-axis room in full; this guide is about what happens once you control the dirt.

One practical note on sequencing: the note file and the conversion evidence live in the same room but in different lanes. During the loan-to-own phase, buyer's counsel works the collateral file; the moment you control the asset, the feasibility, entitlement, and environmental workstreams take over, and the LP and lender lanes open on top. Building it as one room from day one means you never re-key the property basics when the deal shifts from paper to dirt.

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How do you underwrite feasibility and entitlement before you go hard?

The two gating questions of any conversion are can you legally build residential units in this envelope (entitlement) and how many (feasibility) — and you answer both before your deposit goes non-refundable. The questions below are the ones that decide whether the deal survives diligence.

As-of-right conversion vs rezoning — which path, and who decides?

An as-of-right conversion is permitted under existing zoning and needs no discretionary approval, so it's dramatically faster and more financeable; a rezoning requires a public land-use approval and adds time, cost, and political risk. Whether your building is as-of-right is a legal question answered by a zoning or land-use attorney reading the code against your specific lot, use, and floor plates — that opinion is the first document in the room, because a construction lender and your LPs will not fund an entitlement assumption. In New York, City of Yes for Housing Opportunity (effective December 5, 2024) moved conversion eligibility citywide to non-residential buildings that existed as of December 31, 1990 (built before 1991), up from the old 1961 cutoff (1977 in Lower Manhattan) that applied only in parts of Manhattan, Queens, and Brooklyn — widening the universe of buildings that can convert under relaxed light-and-air standards. But the eligibility year and the as-of-right determination are jurisdiction-specific and change over time. Peony is the room where the zoning opinion, the code sections, and the feasibility work get permissioned to lenders and LPs; it is not zoning counsel and does not determine as-of-right status — get that opinion in writing before you go hard.

Should I get the zoning opinion before or after I go hard on the deposit?

Before — the zoning or as-of-right opinion is the gating item, and going hard (making your deposit non-refundable) before you have it is how first-time conversion sponsors lose earnest money. The entire conversion thesis rests on being able to build residential units in that envelope: if the building isn't as-of-right and you're assuming a rezoning that doesn't come, or the relaxed light-and-air rules don't reach your floor plates, the unit count that drives your whole model evaporates. So the standard sequence is to keep the deposit refundable through a diligence period long enough to land the zoning opinion first, then the floor-plate and light-and-air feasibility, then the ACM/asbestos survey and Phase I, then tenant estoppels and surrender agreements — and only then, with the evidence in hand, go hard and move toward the construction-lender close. Sequencing them in that order means you spend money to remove risk in the order that can kill the deal. Peony is where that evidence accumulates and gets shown, in sequence, to the seller, your LPs, and the lender; it doesn't advise on your deposit — your counsel does.

My floor plates are deep — is the conversion dead?

Not necessarily, but deep floor plates are the single most common reason a conversion doesn't pencil, so this is a feasibility question you answer early with a real study, not a hope. The driver is light and air: every habitable room generally needs an operable window and natural light, so the distance from the window line to the building core determines how much of each floor can become an apartment versus dead interior space. The rule of thumb cited by conversion architects is that the best candidates have window-to-core distances around 40 feet or less, with a unit-depth sweet spot near 30-35 feet; buildings running past 50 feet — and some midcentury plates run 60 feet deep — are poor candidates or need creative fixes. Those fixes exist: cutting a new light well or interior courtyard, carving an atrium, or pushing exterior walls in to add light (Gensler has done this on real projects), but they cost money and unit count. This is why feasibility gets studied before you go hard — Gensler has assessed more than 1,300 potential conversions and found only about 25% score as suitable candidates, so a deep-plate building is a real risk, not an automatic no. The floor-plate and light-and-air study is a data-room document; the feasibility architect answers whether your plates work, not the room.

Will a light-and-air study kill my unit count?

It can — that's exactly what the study is for, and finding out early is the point. The feasibility architect's scorecard translates window-to-core geometry, floor-plate shape (rectangular plates around 8,000-12,000 square feet convert best), and the light-and-air rules into an achievable unit count — which is the single input your entire model hangs on. If the plates are deep and the fixes (light wells, atria) cost too much unit count to pencil, the study tells you before you've gone hard, not after you've promised LPs 210 units the building can only deliver 150 of. Gensler's scorecard runs out of 100, with strong candidates scoring in the 70s-80s; treat that scorecard as a core data-room document, because it's the first thing a skeptical LP or lender will want to see. A study that trims your count is doing its job — it's converting a hope into a number you can underwrite.

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How do you sequence zoning, asbestos, and estoppels in conversion diligence?

You sequence from the risk most likely to kill the deal to the risk you address last, because each step you clear makes the next one worth paying for. The order that experienced sponsors run — and that keeps your deposit refundable until the deal is de-risked — is a chain, and it's the spine of the whole room:

1. Zoning / as-of-right opinion. Can you build residential units here at all, and under what rules? If the answer is "only with a rezoning you can't get," you stop here and keep your deposit. Everything downstream assumes this passed.
2. Floor-plate & light-and-air feasibility. The feasibility architect studies window-to-core depth against the light-and-air standards to derive an achievable unit count. This is where deep plates kill deals — before you've spent on environmental.
3. ACM/asbestos survey and Phase I ESA. With the envelope and unit count validated, price the environmental: the asbestos survey (abatement is a real line item on a pre-1980 building) and the Phase I environmental, including vapor-intrusion screening for a residential end use.
4. Tenant estoppels and surrender agreements. Now that the deal pencils, paper the path to vacant possession: estoppels for the leases that remain, surrender agreements for the tenancies you're buying out, and a rent roll that shows the burn-down to zero.
5. Go hard, then the construction lender. With the killable risks retired and evidenced in the room, make the deposit non-refundable and take the assembled package to the LP raise and the construction lender.

Each item removes a specific deal-killing risk, and you pay for them in the order that lets you walk cheapest if a gate fails — run environmental before feasibility and you might pay for an asbestos survey on a building whose plates never converted. The room mirrors this chain, folders in sequence, each result dropped in as you clear it, so anyone reading it can see which risks are dead and which are still live.

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What entitlement and incentive evidence belongs in the room?

The zoning opinion, the specific incentive program your deal relies on with its eligibility proof, and the affordability math — because incentives frequently make the difference between a conversion that pencils and one that doesn't, and lenders and LPs underwrite the incentive as carefully as the rent. Incentive programs are jurisdiction-specific and change often, so the room documents the exact program, the exact requirements, and your building's eligibility.

New York — 467-m (the conversion tool, not 485-x). The load-bearing trap first: 485-x is the new-construction program (it replaced 421-a for ground-up rental); 467-m is the office-to-residential conversion exemption ("Affordable Housing from Commercial Conversions"). Do not swap them. Under 467-m, at least 25% of dwelling units must be affordable rental units; the weighted-average AMI across all affordable units cannot exceed 80% AMI (this is a weighted-average cap, not a flat 80% per unit); at least 5% of units must be at 40% AMI; the affordable units are permanently subject to rent stabilization; and at least 50% of the completed building area must come from the pre-existing building. The property-tax exemption is 90% in the Manhattan Prime Development Area (Manhattan south of 96th Street) and 65% outside it, with benefit durations tiered by when construction commences. Writing "25% of units at 80% AMI" flatly is the error to avoid — it's a weighted average with a 40%-AMI floor baked in.

New York — City of Yes eligibility year. As covered above, City of Yes moved conversion eligibility citywide to buildings that existed as of December 31, 1990 (built before 1991), up from the old 1961 cutoff (1977 in Lower Manhattan). That's the eligibility-year move; confirm it against current guidance before relying on it.

Historic tax credit — only the 20% federal credit survives. The 2017 tax law retained the 20% federal Historic Rehabilitation Tax Credit for certified historic structures used for income production (rental conversions qualify), but now requires it to be claimed ratably over 5 years (4% per year) rather than all at once — and it repealed the separate 10% credit for non-historic pre-1936 buildings. So the 10% credit is not a live option; only the 20% certified-historic credit remains, and only if the National Park Service certifies the structure. If your deal leans on it, the certification path is a room document.

Other cities — hedge and point to the source. Programs move fast and their terms shift. Washington, D.C. runs a downtown conversion property-tax abatement (Housing in Downtown) whose affordability set-aside has been amended and is reported inconsistently across sources — don't print a specific D.C. percentage; state that the terms have shifted and point to the current DMPED term sheet before relying on any figure. Chicago's "LaSalle Street Reimagined" initiative pairs TIF subsidy with an affordability requirement on a cluster of downtown conversions. Calgary's downtown conversion program is active (it reopened in June 2026 with a fresh funding round) — and note the trap: the widely cited $75-per-square-foot figure in the 2026 round is the hotel-conversion rate, not the residential grant, so don't misapply it. In every case, the room should hold the specific program's current term sheet and your eligibility analysis, not a stale summary.

Peony holds and permissions all of this; it is not incentive counsel and does not certify eligibility for 467-m, the historic credit, or any local program — your tax and land-use advisers do that, and their opinions are what go in the room.

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How do you prove vacant possession and clear the environmental?

A conversion needs the building substantially empty and its environmental risks priced — and the lender wants both evidenced, not asserted. Tenancy and environmental are the two workstreams that most often surface late, so they get their own cluster of questions.

Estoppels vs surrender agreements — what does the construction lender actually require?

Both, for different reasons: estoppel certificates confirm the truth about the leases that remain, and surrender (lease-termination or buy-out) agreements are how you deliver the vacant possession a residential conversion needs — and the construction lender wants the path to vacancy evidenced, not just asserted. A tenant estoppel certificate is a signed statement from each remaining tenant confirming its rent, term, security deposit, defaults, concessions, and any termination or renewal rights; it's a standard buyer-and-lender requirement, and where a signed estoppel conflicts with the lease, the estoppel generally controls because the tenant is bound by it. But a conversion needs the building substantially empty, so on top of estoppels you need surrender or lease-termination agreements — the negotiated buy-outs that end remaining tenancies and let you show the rent roll burning down to zero. That's the thesis in one line: for a conversion, vacancy is not asserted, it is evidenced — estoppels for the leases that stand, surrender agreements for the ones you're buying out, and a rent roll that shows the burn-down. Peony holds and permissions those estoppels and surrenders and shows the lender the burn-down; it doesn't paper the surrenders — your leasing counsel does.

The practical sequencing point: estoppels and surrenders come after the zoning opinion and feasibility, because there's no reason to spend on buying out tenants until you know the building converts and is as-of-right. But they come before the construction close, because the lender funds against evidenced vacant possession, not a promise. The rent-roll burn-down — the schedule showing occupancy dropping to zero as surrenders execute — is one of the most-scrutinized exhibits in the lender lane.

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Should I buy out the remaining tenants or convert around them?

For a full residential conversion you almost always need vacant possession, so the realistic choice isn't "buy out vs keep" — it's how and when you clear the remaining tenants, and what it costs. A gut conversion touches the whole building — structure, systems, egress, every floor plate — so operating tenants in place through that work is rarely feasible; the norm is to negotiate surrenders and deliver the building empty. The variables that matter are the remaining lease terms (a tenant with ten years left and no termination right is expensive to move), any early-termination or relocation rights already in the leases, and the cost and timing of the buy-outs, which flow straight into your basis and your schedule. This is why the estoppels matter so much: they tell you exactly what each remaining tenancy is (rent, term, termination rights) before you price the buy-outs. Convert-around-them is occasionally viable for a phased or partial conversion, but for the standard office-to-apartment play, model the surrenders, evidence them in the room, and show the lender the burn-down. The buy-out cost is real basis, so it belongs in the economics case — estoppels price the problem, surrender agreements solve it, the rent-roll burn-down proves it to the lender.

Will asbestos in a 1980s tower blow up my conversion budget?

It's a real line item you must price before you go hard, but for most towers it's a manageable, quantifiable cost rather than a deal-killer — the danger is not budgeting for it at all. Buildings constructed or renovated before roughly 1980 are the most likely to contain asbestos-containing materials (ACM), and federal rules (EPA NESHAP) require abatement by a certified contractor before any renovation or demolition that disturbs ACM — which a gut conversion certainly does. So the sequence is: commission an ACM/asbestos survey during diligence, get the results into the room, and price abatement into the budget. As industry estimates (not a quote for your building), a survey commonly runs a few hundred to a low four-figure range; full removal is often cited around $10-25 per square foot and encapsulation lower, with friable material costing meaningfully more than non-friable — always deal-specific and best confirmed by a licensed abatement contractor bidding your actual survey. On a conversion you should also treat the Phase I environmental as live: vapor intrusion from prior uses can be a recognized environmental condition that triggers a vapor-mitigation obligation to protect future residents even after an otherwise clean-ish Phase I. The survey and the Phase I are data-room documents the lender and your LPs will read; Peony holds and permissions them, but the abatement estimate comes from your environmental consultant, not the room.

One nuance specific to conversions: the environmental bar is arguably higher than for an office hold, because you're introducing residential occupants. A Phase I environmental that would be fine for continued office use can trigger a due-care obligation — a vapor-mitigation system, for instance — once the end use is people sleeping there. Scope the environmental for the residential end use, not the current one, and put the reasoning in the room so the lender sees you thought about it.

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What does the conversion cost, and does the basis beat replacement?

The economics of a conversion come down to one comparison — all-in cost versus replacement cost — with the discounted basis on one side and the conversion budget on the other. These questions are where the LP and the lender both do their own math.

What does an office-to-residential conversion cost per unit in 2026?

There's no single number — conversion cost is a wide, source-dependent range, and anyone quoting one clean figure is guessing — but the useful frame is that conversion trades a discounted basis and structural savings against interior and systems spend that rivals new construction. Published estimates put conversion hard-plus-soft costs (excluding land) commonly around $400-600 per square foot, with a broad overall range depending on how much of the structure and systems you reuse; component costs cited include mechanical/electrical/plumbing roughly $20-50 per square foot, structural work $50-150, and interiors $50-100. Ground-up apartments are often cited near $220-700 per square foot (averaging around $398 in 2026). Adaptive reuse is frequently described as roughly 40% cheaper than new build — but note that the '40% cheaper' and the '$400-600 per square foot' figures come from different sources and shouldn't be stacked into one sentence as if from a single study. The savings concentrate in the shell and structure (you're not pouring a new frame); they're offset by comparable-or-higher spend on new residential systems, and conversions can finish months faster than ground-up. The honest answer to a lender or LP is a range with your own consultant's hard-bid numbers behind it. Peony is where those cost exhibits and the GC's estimate live and get shown; it doesn't produce the estimate — your cost consultant does.

The plumbing and structural realities sit underneath those ranges. An office tower clusters its bathrooms near the core with a handful of risers; an apartment building needs plumbing to every unit — new risers and stacks distributed across each floor, the cost driver the MEP line captures. Structurally, converting is usually kinder than building new (the frame exists), but floor-to-floor heights, slab penetrations for new plumbing, and window modifications for light-and-air compliance all show up in the structural line. Break the conversion budget into these workstreams with the consultant's numbers attached, so a lender sees an estimate built bottom-up, not backed into.

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Is $72 per square foot plus conversion cost still below replacement?

That's the whole basis case, and it's the number the acquisition, the equity, and the lender all turn on — so the room has to make it checkable, not asserted. Work the persona example: a sponsor chasing a 240,000-square-foot 1980s tower at roughly $72 per square foot is buying the shell for about $17 million. Against a replacement cost north of $400 per square foot to build the same units new, that basis is the entire reason to convert rather than build — you're acquiring the structure at a fraction of what pouring a new one would cost. The math only works, though, if acquisition plus conversion plus soft costs plus carry still lands below replacement once real conversion numbers are bid. That's why the discounted basis is non-negotiable for a conversion: published thresholds vary (one commonly cited example holds that a Class C building needing $225-plus per square foot to renovate has to be bought for well under $100 per square foot to pencil), and in many markets conversions don't produce positive returns without incentive support — which loops back to why the 467-m or historic-credit evidence belongs in the room.

The institutional version is 1740 Broadway: the basis reset from $605 million (2014) to roughly $185 million (2024) is what made the conversion — and ultimately the $480 million construction loan — financeable. Whether it's a $17 million shell or a $185 million debt position, the discipline is identical: prove all-in cost beats replacement, and show the work. A lender and an LP both rebuild your basis case from the exhibits; if they're missing, or the LP model and lender package disagree, the deal stalls. One source of truth means the basis number is the same everywhere it's read.

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What returns do LPs expect on a conversion versus ground-up multifamily?

LPs price a conversion as a higher-risk, higher-complexity bet than a stabilized multifamily acquisition and closer to — or riskier than — ground-up development, so they expect a development-style return premium for the entitlement, feasibility, and execution risk they're taking; I won't invent specific IRR or multiple benchmarks, because those are deal-, market-, and cycle-specific and any number I printed would be misleading. What actually moves the LP decision is whether the risk that justifies the premium has been retired: is the building as-of-right (or is entitlement still open), do the floor plates pencil under a real light-and-air study, is the environmental scoped and priced, and is the basis genuinely below replacement cost. A first-time conversion sponsor wins the raise not by promising a headline return but by showing that the killable risks are already dead in the room — the zoning opinion, the feasibility study, the ACM survey, the estoppels and surrenders, and a basis-versus-replacement case an LP can check. The return math flows from that evidence. Peony is the room where LPs see that evidence alongside your model and track record, with page analytics that show you who actually read the feasibility study; it is not an investment adviser and takes no view on your projected returns.

If you want the mechanics of the raise itself — the operating agreement, the waterfall, subscription docs — that's a fund-and-syndication topic; see real estate fund data room. Here the point is narrower: the LP return case is downstream of the evidence, so the strongest thing you can put in front of an LP is a room where the deal-killing risks are visibly retired.

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How do you run one room for the seller, the LPs, and the construction lender?

You build a single evidence room as the source of truth, then run three permission lanes off it — so every audience reads the same documents through a different window, and no two packages can disagree. This is the Peony wedge for conversions, and it's the answer to the question every first-time sponsor eventually asks.

The seller/broker lane (acquisition). During the buy — whether you're acquiring the fee or the note — the seller and their broker see what they need to transact: the LOI, the diligence you're conducting on their asset, the items that move price. They do not see your LP economics or your projected returns. Their lane closes when you close.

The LP lane (the raise). Once you control the deal, the LP lane opens on the same diligence, with the raise materials layered on top: the deck, the model, the operating agreement, your track record. Crucially, the LPs are reading the exact feasibility study, ACM survey, and basis case the lender will read — so the LP deck can't quietly contradict the lender package, because they're the same files. Page-level analytics tell you which LP actually opened the ACM survey before they committed, and which only skimmed the deck.

The lender lane (the construction close). The construction lender's lane pushes the feasibility study, the surrenders and rent-roll burn-down, the environmental reports, and the basis case forward — that's what it funds against. The lender sees the evidence that vacant possession is real and the plates convert; it doesn't need your LP subscription list.

The connective tissue is one set of files, three sets of permissions. Per-viewer watermarks put each recipient's identity on every page across all three lanes, so a leaked feasibility study names whose copy it was. Role-based groups keep the seller out of the LP economics and the LPs out of the lender's fee letters. And the NDA gate means each party agrees to confidentiality before they open a document. The payoff is consistency: the number in the LP model is the number in the lender package is the number in the appraisal, because there's exactly one document behind all three.

This is what Peony is built for. 6,800+ customers run permissioned rooms on it, at a flat rate — the Data Room plan at $52/month is the most popular, with the Business plan at $30/month and the Deal Team plan at $64/month (minimum four seats) for larger teams — with unlimited free viewers and no per-page fees. That matters for a conversion: you're circulating a feasibility study, an ACM survey, and a basis model to a seller, a dozen LPs and their analysts, and a lender's whole underwriting team, and you shouldn't pay per seat or per page to keep the room honest. Peony's honest boundary: it's the room, not the deal team — it's not zoning counsel, not your feasibility architect, and it doesn't certify incentive eligibility. See pricing for the full plan comparison.

Can I run one data room for the seller, my LPs, and the construction lender?

Yes — and for a conversion that's the entire point, because the same body of evidence gets underwritten three times and the fastest way to lose credibility is to let the LP deck contradict the lender package. A conversion is bought on evidence: feasibility, entitlement, environmental, tenancy, and basis. You need that evidence to buy the asset (or the note), then again to raise the LP equity, then again to close the construction lender. Build the room once as the single source of truth, then run three permission lanes off it: a seller/broker lane during acquisition (they see what they need to transact, not your LP economics); an LP lane with the raise materials — the deck, the model, the operating agreement — layered on top of the same diligence; and a lender lane with the feasibility study, the surrenders, and the environmental reports pushed forward. Per-viewer watermarks put each recipient's identity on every page, and page-level analytics tell you which LP actually opened the ACM survey before they wired. One set of files means the number in the LP model is the number in the lender package is the number in the appraisal — they're all reading the same document. Peony is built for exactly this: 6,800+ customers run permissioned rooms on it, at a flat rate with unlimited free viewers and no per-page fees.

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What documents belong in an office-conversion data room?

The evidence, organized so a seller, an LP, and a lender can each find what they underwrite — sequenced from the risks that kill deals to the ones you address last. Here's the working checklist, mapped to who reads each folder.

The checklist doubles as the argument. When the folders are in this order — zoning first, feasibility next, environmental and tenancy after, basis throughout — anyone reading the room sees the thesis being proven step by step: it's as-of-right, the plates convert, the environmental is priced, vacancy is deliverable, and the basis beats replacement. That's the same reason the note sale data room leads with the collateral file, the multifamily acquisition room leads with the rent roll, and an industrial data room leads with the lease — in each asset class, the index is the argument, and for a conversion the argument is the evidence chain, read three times.

Each workstream also has a signature failure mode — the one thing that, left late or unpriced, blows up the deal. This is the buyer's-eye version, graded by what goes wrong.

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What kills a first-time conversion deal, and how do you raise anyway?

The two risks that keep first-time sponsors up at night are the deal dying in diligence and the LPs passing on an unproven operator — and both are managed the same way, by retiring killable risk in the room before anyone can ask about it.

Why do office conversion deals die in due diligence?

They die when a killable risk isn't retired in the right order — usually feasibility, entitlement, or basis — and the sponsor discovers it after going hard or after promising LPs a unit count the building can't deliver. The recurring killers: floor plates too deep for light and air, so the achievable unit count collapses and the model breaks (only about 25% of the 1,300+ buildings Gensler assessed scored as suitable candidates); an as-of-right assumption that turns out to require a rezoning, adding time and discretionary risk a lender won't fund; a basis that isn't actually below replacement cost once real conversion costs are bid; asbestos or a vapor-intrusion condition that wasn't priced; or remaining tenancies that can't be surrendered, so vacant possession — and the construction loan — never materialize. The through-line is sequencing: each of these is knowable before you go hard if you run the diligence in the order that removes deal-killing risk first — zoning opinion, then floor-plate/light-and-air feasibility, then environmental, then estoppels and surrenders — and put each result in the room as you clear it. Deals die when that evidence arrives late or contradicts the pro forma. Peony is the room that keeps the evidence sequenced and consistent across the seller, LP, and lender lanes; it can't make a deep-plate building convert — only the feasibility work can tell you that.

Will LPs back a first-time conversion sponsor?

They can, but a first-time conversion sponsor is underwritten harder — the LP is betting on the deal and on you — so the way to win the raise is to over-index on evidence and de-risking rather than on a pitch. LPs backing a first-timer look for the killable risks already retired in the room (zoning opinion in hand, feasibility study showing the plates pencil, ACM survey and Phase I done, estoppels and surrenders papered, basis-below-replacement demonstrated), a credible team around the gaps (a conversion-experienced GC, a feasibility architect, and land-use counsel named and engaged), and a basis case they can independently check. A ground-up multifamily track record helps but doesn't fully transfer — conversion adds entitlement and existing-building risk that ground-up doesn't have — so honesty about what's new, paired with evidence that the new risks are handled, reads better than pretending it's the same game. The single best credibility move is a clean, permissioned room where an LP can see the diligence, watermarked to them, with the same numbers the lender is seeing. Peony is that room — 6,800+ customers use it to run raises alongside deal diligence — but it's a document platform, not a placement agent, and it doesn't raise the equity for you.

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The bottom line: build the evidence room once, run it three times

A conversion is bought on evidence, and the sponsor needs that evidence three times — to buy the asset or the note, to raise the LP equity, and to close the construction lender. The discipline that makes a first-time conversion financeable is to build the room once and run three permission lanes off it, so the number in the LP model is the number in the lender package is the number in the appraisal. Here's the segmented read.

• Entering through the debt (loan-to-own): Start with the collateral file — the note sale data room — then open the conversion lanes on top of the same room the moment you control the asset. Don't build two rooms; extend one.
• First-time conversion sponsor raising LP equity: Over-index on evidence, not the pitch. Get the zoning opinion, the feasibility study, the ACM survey, and the estoppels/surrenders into the room in sequence, and show LPs the exact files the lender will read. A room like Peony — role-based groups, per-viewer watermarks, page-level analytics, NDA gate, a flat $52/month most-popular plan, unlimited free viewers, no per-page fees — fits the three-audience shape without a per-seat meter. With 6,800+ customers across M&A, fundraising, and real estate, that's the lane it's built for.
• Institutional sponsor running a large conversion: Same discipline, bigger stakes — 1740 Broadway is the template: note purchase, basis reset, LP equity, then a $480 million construction close, all off one underwriting room. The consistency across audiences is what a $480 million lender funds against.

Whichever tier you're in, the rule is the same: prove the thesis on evidence, sequence the diligence so deal-killing risk dies first, and keep one source of truth across the seller, the LPs, and the lender. Peony is the room that keeps that evidence organized, permissioned, and consistent — it is not zoning counsel, not your feasibility architect, and it does not certify incentive eligibility. Those opinions come from your advisers and go in the room; the room's job is to make sure all three audiences read the same truth.

If you're staging the room and want the broader provider landscape and cost benchmarks first, see our what is a virtual data room primer and the due diligence cost breakdown before you commit — and note that a flat-rate room like Peony is a different cost structure from the enterprise incumbents (Datasite runs into the tens of thousands per deal, roughly $68K in cited cases; iDeals is commonly cited around $500-1,000 per month), which matters when the same room has to serve three audiences on a single conversion.

Sources

• RentCafe / Yardi Matrix — Adaptive Reuse 2026 report: ~90,300 apartments in the 2026 office-to-apartment conversion pipeline, up 28% from 70,600 a year earlier; office = 47% of adaptive-reuse units; metro pipeline (New York 16,358, Washington D.C. 8,479, Chicago 4,360, Los Angeles 4,340, Dallas 3,966). RentCafe methodology; CBRE tracks conversions differently and reports a lower unit count on its own 58-market set.
• Trepp (via MBA NewsLink) — office CMBS delinquency ~11.57% in June 2026 (up 4 bps), off a record 12.34% in January 2026 (prior high 11.76% in October 2025); office remains the most-distressed major property type.
• Gensler — "What We've Learned by Assessing More Than 1,300 Potential Office-to-Residential Conversions": over 1,300 buildings assessed, only ~25% score as suitable candidates; scorecard out of 100, strong candidates in the 70s-80s.
• NYC HPD — RPTL §467-m ("Affordable Housing from Commercial Conversions"): the conversion exemption (distinct from 485-x new construction); ≥25% affordable units at a weighted-average ≤80% AMI with ≥5% at 40% AMI, permanently rent-stabilized; ≥50% of building area pre-existing; 90% exemption in the Manhattan Prime Development Area vs 65% outside.
• Holland & Knight / NYC Planning — City of Yes for Housing Opportunity (effective Dec 5, 2024): conversion eligibility moved citywide to buildings existing as of December 31, 1990 (built before 1991), up from the 1961 cutoff (1977 in Lower Manhattan).
• National Park Service / IRS — 20% Historic Rehabilitation Tax Credit: retained for certified historic structures used for income production, now claimed ratably over 5 years; the separate 10% credit for non-historic pre-1936 buildings was repealed by the 2017 tax law.
• CBRE — office removals (demolition/conversion) projected to exceed new office construction in 2025 across the 58 largest US markets (~23.3M sq ft removed vs ~12.7M sq ft delivered; ~12.8M sq ft of conversions); ~76% of active conversions planned as multifamily.
• 1740 Broadway (the former MONY Building), Manhattan — Blackstone acquired for $605M (2014), defaulted and handed back the keys (March 2022); Yellowstone acquired Blackstone's debt position for ~$185-200M (April 2024); Yellowstone closed a $480M construction loan from Madison Realty Capital (June 18, 2026) for a ~420-unit conversion (~238 rentals + 182 condos). Sources: Davis Polk (acquisition), Commercial Observer (loan purchase), The Real Deal (construction loan).
• Cost and basis ranges — conversion hard-plus-soft costs commonly cited ~$400-600/sf (excl. land), with component MEP ~$20-50, structural ~$50-150, interiors ~$50-100; ground-up apartments ~$220-700/sf (avg ~$398 in 2026); adaptive reuse often described as ~40% cheaper than new build (separately sourced, not to be stacked). Basis thresholds are deal- and market-specific; many conversions require incentive support to pencil (NAIOP, NYC Comptroller). Asbestos and vapor-intrusion figures are industry estimates (EPA NESHAP; ASTM Phase I / vapor-encroachment framework), not quotes.
• Other-city programs (terms shift — verify current sources before relying): Washington D.C. Housing in Downtown (check the current DMPED term sheet for the affordability set-aside); Chicago "LaSalle Street Reimagined"; Calgary Downtown Office Conversion Program (active, reopened June 2026 — the cited $75/sf is the hotel-conversion rate, not the residential grant).

This article is general information for deal teams, not legal, tax, environmental, or investment advice. As-of-right and zoning determinations, incentive eligibility (467-m, historic credits, and local programs), affordability requirements, environmental obligations, foreclosure and deed-in-lieu procedure, construction-lending terms, market pipeline and delinquency figures, conversion costs, and the specific deals and programs referenced all change over time and vary by jurisdiction — verify current figures and confirm as-of-right status, incentive eligibility, environmental scope, and enforceability with qualified counsel and consultants before relying on them. Peony is a data room provider, not zoning counsel, a feasibility architect, an environmental consultant, a broker, a lender, or an investment adviser; it holds, permissions, watermarks, and logs the evidence but does not certify eligibility, opine on feasibility, or produce the studies.