Value-Add Multifamily Model: Underwriting a 48-Unit Repositioning
Value-add multifamily has a simple pitch — buy tired units, renovate, capture the rent premium, harvest the value — and a specific way of going wrong: every step of that pitch is an assumption, and the assumptions multiply. The premium must be real, the budget must hold, the units must turn on schedule, and the market must still pay for the stabilized income when you get there. A value-add model exists to price those assumptions one at a time, and this case study shows the whole exercise on one deal.
The deal: a 48-unit 1980s garden property, offered at $5,700,000 ($118,750 per door). In-place rents average $1,150; renovated comparables lease around $1,300. The plan: renovate 40 units at $12,500 each ($500,000) as leases turn over roughly 24 months, capture the $150 premium, and hold ten years. Every figure is illustrative, constructed to be internally consistent — this is the same deal walked tab by tab in our worked pro forma example; here the subject is the deal logic rather than the model tour.
Start With the Two NOIs
Value-add underwriting begins by refusing to let the deal have one NOI.
In-place: at current rents, the property grosses $662,400, and after 8% economic vacancy (physical, concessions, bad debt) plus other income, collects an EGI of about $632,000; expenses at $5,800 per unit leave in-place NOI of roughly $354,000 — a 6.2% going-in cap on the price. That is the property you are actually buying on closing day.
Stabilized: with 40 renovated units at $1,300, the eight classic units drifting to $1,175, economic vacancy tightening to 7%, and expenses stepping up to $6,100 per unit (renovated product costs more to run, and taxes follow value), stabilized NOI models to about $417,400.
The bridge between them — roughly $63,400 of NOI uplift — is the entire deal. Everything that follows is the interrogation of that one number: what it costs to create, what evidence supports it, when it arrives, and what it is worth.
The Premium: Evidence Before Arithmetic
The $150 premium is the load-bearing assumption, so it gets underwritten like one:
Comps of the destination, not the origin. The evidence for $1,300 must be leases on renovated units of comparable vintage and location — units that look like yours will look after $12,500, not before. Comping the premium off classic units plus wishful thinking is the signature value-add error, because it prices the renovation twice: once in the premium and once in the baseline.
Scope that matches the comp. $12,500 per unit buys a specific finish level; the comps commanding $1,300 must be achievable at that scope. A premium supported only by comps with $25,000 renovations is a $150 assumption wearing someone else's budget.
Partial capture as the base case. The model deliberately leaves eight units unrenovated and holds economic vacancy at 7% even stabilized — the premium is underwritten on the units that get the work, with friction, not smeared across the property at perfection.
The Budget: Scope, Contingency, and the Clock
The $500,000 budget carries three disciplines. It is built per-unit from a written scope, not backed into from what the deal can afford. It phases on turnover — roughly 24 months to cycle 40 leases, because renovating occupied units means waiting for them to empty, and forcing turnover has its own vacancy cost the model must eat. And it sits inside a plan that prices carry: the renovation months where a unit produces nothing are modeled as vacancy drag in the ramp years, not ignored.
The full budget-construction discipline — line-item scope, contingency sizing, draw tracking against actuals — is its own subject, covered in the renovation budget guide. For this case study, the essential point is structural: the budget, the premium, and the timeline are one linked system in the model, so that stressing any of them reprices the others.
The Value Math: What the Plan Is Worth
Now the arithmetic that justifies — or fails to justify — the whole exercise.
Value created. The $63,400 of stabilized NOI uplift, capitalized at an illustrative 6.25% market cap for stabilized product, is worth about $1,010,000. Against the $500,000 renovation budget, the plan creates roughly two dollars of value per dollar spent — the classic value-add ratio, and the first number an experienced reviewer computes.
The margin on total cost. Stabilized NOI over total cost — price, closing, and budget, about $6,314,000 — gives a yield on cost of 6.7%. Against the 6.25% stabilized market cap, that is a spread of roughly 45 basis points: the stabilized property is worth about $6,680,000 against $6,314,000 all-in, a creation margin of ~$365,000, or under 6% of cost. This is the deal's honest confession: the plan works, but the compensation for execution risk is modest. A reviewer who computes only the 2:1 renovation ratio sees a strong deal; the yield-on-cost spread shows the same deal as a thin one, because the ratio ignores that most of the capital is buying the existing income at a full price.
The financed version. At 65% LTV ($3,705,000, illustrative 6.4%, 30-year), debt service of $278,100 gives 1.27x coverage on in-place NOI — clearing a 1.25x floor with almost nothing to spare — ramping to 1.50x stabilized. Equity of about $2,610,000 (down payment, closing, and the budget) earns a thin 3.8% cash-on-cash in year one, climbing to 5.3% stabilized: the standard value-add signature of capital going in early and income arriving on the renovation schedule. Over the ten-year hold, with a conservative 6.5% exit cap on forward NOI, the deal produces a levered IRR of about 10.8% and an equity multiple near 2.4x.
The Stress Tests: Where This Deal Actually Lives
A value-add model earns its keep in the scenarios, because the two assumptions the buyer controls least — the premium and the clock — are exactly the ones the base case takes for granted. Rerun the same model:
Premium captures at $100, not $150. Stabilized NOI falls to about $395,000; the uplift shrinks to $41,000, worth roughly 1.3x the renovation dollar instead of 2.0x; and the levered IRR drops to 9.4%. One-third of the premium — fifty dollars a month per unit — costs nearly a point and a half of IRR, because the premium is almost the only margin the deal has.
Stabilization slips a year (36 months of turnover instead of 24, full premium): IRR 10.1%. Time is gentler than price here — but only because the premium eventually arrives in full.
Both — $100 premium, slow capture: IRR 8.7%. This is the scenario an honest committee memo names out loud, because it is not a disaster case; it is merely ordinary friction on both assumptions at once, and it takes the deal from acceptable to questionable against most value-add hurdles.
The reading across the three: this deal's return does not live in the market (the exit cap was already conservative) — it lives in execution, and specifically in the premium. Which converts directly into diligence instructions: the renovated-comp evidence deserves more hours than anything else in the file, and the first few renovated units after closing are not just units — they are the live test of the entire thesis, to be re-underwritten against, in the model, the month their leases sign.
The Premium Evidence File
Because the stress tests just located the deal's entire margin in the premium, the diligence package for it deserves specification. Three components:
The comp table. Renovated comparables only — address, vintage, distance, finish level, unit type, asking and (where obtainable) effective rents, concessions — with an adjustment column and a stated conclusion per unit type. Five thin comps with honest adjustments beat fifteen headline rents.
The unit walk. Physical inspection of both ends of the thesis: your classic units (does $12,500 of scope actually bridge the gap to the comps' finish level?) and, where possible, the comps themselves. The premium lives in the distance between two physical products; someone on the team should have seen both.
The post-closing re-underwrite protocol. The plan, written before closing, to treat the first tranche of renovated units as the live experiment: lease them, compare achieved rents and days-on-market against pro forma, and re-run the model with the achieved figures before releasing the budget for the remaining scope. The scenarios above already priced what a $100 outcome does to the deal; this protocol is how you find out in month four instead of year three — while most of the budget is still uncommitted and the plan can still be cut, re-scoped, or re-priced.
The Exit Story
One more assumption deserves its named defense: who buys this property in year ten, and at what price logic. The model's 6.5% exit cap — 30 basis points above entry — encodes the conservative answer: the buyer of the stabilized asset pays a market price for proven income on a then-older building, with no credit for the story, because by exit the story is already in the rent roll. Two structural notes follow. First, this is exactly why the exit-cap toggle in the sensitivity grid matters more on value-add than on stabilized deals — the reversion carries a larger share of a back-loaded return. Second, sale is not the only harvest: at stabilization the deal can instead refinance against the ~$6.68 million stabilized value, returning a substantial share of equity while keeping the asset — a path the same model should price alongside the sale, because IRR-hungry structures and patient capital will disagree about which harvest to prefer.
What Makes a Model Fit for This Work
The case study quietly used a specific set of machinery, and it is the checklist for any value-add multifamily model:
- Two-column rent roll — in-place and market by unit type, with loss to lease computed.
- A T-12 bridge — in-place to stabilized NOI as named, individually stressable adjustments.
- A phasing renovation module — scope, per-unit cost, premium, and schedule as linked inputs, with revenue that ramps on turnover.
- Dual-constraint debt — coverage tested on in-place income, where this deal nearly binds.
- Yield on cost beside the market cap — the one-line margin diagnostic.
- Scenario capability — the premium and the clock as live inputs, so the three stresses above are minutes, not rebuilds.
Run the same interrogation on any value-add offering — the institutional underwriting checklist is the full sixteen-check version — and the deals sort themselves quickly.
Frequently Asked Questions
What rent premium should a renovation produce? Whatever renovated comparables in the submarket actually lease for, minus honest adjustment — never a ratio of budget. The evidence runs from comps to premium; deals underwritten from budget to premium are assuming the conclusion.
What is a good yield-on-cost spread for value-add multifamily? The spread over the stabilized market cap is the compensation for execution risk, so "good" scales with the plan's difficulty. What the case study shows is how to read a thin one: a few dozen basis points means the plan must go nearly perfectly, and the stress scenarios tell you what imperfection costs.
Should the renovation budget be financed or funded with equity? Both are common — bridge and agency renovation programs fund budgets at leverage, at the price of a refinance event the model must then carry. This case study equity-funded the budget for clarity; a financed version adds proceeds and risk in the same motion, and the model should show both variants before the capital plan is chosen.
How long should stabilization take? As long as the leases take to turn — a property on 12-month leases cycles its units in roughly a year if every expiring tenant leaves, which they do not. Two years for a 40-unit scope is a defensible planning case; the model's job is to price the slower one too.
Run Your Own Repositioning
This entire case study — the two NOIs, the phased premium, the linked budget and timeline, the scenarios — is the standard workflow of The Multifamily Sheet, which ships pre-filled with this illustrative 48-unit deal so the machinery is live before you enter a number: fully unlocked, formula-transparent, with the documented methodology PDF. For larger or messier repositionings where the T-12 normalization and unit-level analysis are the battle, the Multifamily Underwriting Suite extends the same conventions with heavier diligence machinery.
This article is for educational purposes only and does not constitute investment, legal, or tax advice. All figures are illustrative examples, not market data or forecasts. Consult qualified professionals before making investment decisions.
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