Underwriting for Multifamily Properties
Hundreds of leases. One rent roll. Answers in minutes.
Smart Capital Center's AI reads the rent roll and the operating statements, checks them against each other, and builds the model your team works from.
Smart Capital Center's AI reads the rent roll and the operating statements, checks them against each other, and builds the model your team works from.
Trusted by commercial real estate leaders
Multifamily underwriting is how you check whether an apartment property earns enough to cover its loan payments and still deliver a return. The Federal Housing Finance Agency set 2026 multifamily loan purchase caps for Fannie Mae and Freddie Mac at $88 billion each, a combined $176 billion, a 20.5 percent increase over 2025. It works differently from other kinds of commercial property. An apartment building has hundreds of leases, and most of them end within a year, so the income can move quickly in either direction. That makes two documents matter more than anything else: the rent roll and the last twelve months of income and expenses.
Insurance is now a defining line item rather than a rounding error. The National Apartment Association's 2026 Premium Pulse analysis found national same-store multifamily insurance costs rose from $502 per unit in 2021 to $777 per unit in 2024, a 55 percent increase, with rates in markets such as Houston now passing $1,200 per unit.
On a value add deal, how fast the work gets done usually matters more than how much extra rent it earns.
Every output is a draft for your team. The AI suggests, your analyst decides.
signals behind every comparable
properties in our database
analyzed in CRE transactions
real-time risk and market analysis
30x Productivity Gain
Smart Capital's capability to extract, standardize, and analyze data from property financials, combined with automated reconciliations and analyses, has already transformed our operations.Instead of the 30-40 minutes, it took us previously to process a single financial statement, it now takes 1-3 minutes with Smart Capital.
Removed Most of the Manual Work
Smart Capital has removed most of the manual work that was taking a lot of time from our team. The solution allows us to focus on more productive, higher-level work, and we get the results much faster.
40% Less Time to Prepare Financial Model
We are midway through our implementation of Smart Capital and we already achieved a 40% reduction in the time required to prepare a financial model for a loan.
Smart Capital allows us to transform our business
Smart Capital allows us to transform our business. My team and I are more confident that our decisions are more objective, data-driven, which minimizes our risk.
We Can Pre-Screen More Deals
Smart Capital Center has become an integral part of our initial underwriting and loan analysis. With the platform, we can review significantly more applications with greater depth and consistency, allowing us to identify and prioritize the strongest opportunities aligned with our affordable housing finance mission. We’re not just working faster—we’re focusing our underwriting attention where it’s needed most. These efficiencies allow us to pre-screen more projects, expand our impact and direct capital to the most viable projects and communities that need it most.
We Can Underwrite a Deal in a Week Instead of a Month
It's a lot easier now to have a team that helps me. The end product is so detailed that the finance brokers were impressed — sponsors usually don't hand over that kind of underwriting. The software and the scrubbing capability with the AI has been enormous. As a sponsor, you must know your numbers cold, and Smart Capital Center lets me do that.
A rent roll is a list of every apartment in a property. For each one it shows who lives there, when their lease starts and ends, what they pay, and whether the unit is occupied. It tells you what the property earns right now and when each rent can be raised.
A T12 is a record of what a property actually earned and spent over the last twelve months. Twelve months covers a full year of seasons, so it shows the real pattern rather than one good month. Any forecast gets checked against it.
Loss to lease is the difference between what a unit could rent for today and what the current tenant is paying. It shows how much extra income is available once those leases end.
Economic vacancy is all the rent a property does not collect. It counts empty units, unpaid rent, move-in discounts, and units used by staff or as models. It is almost always higher than the number of empty apartments alone, and it is the figure worth planning around.
Unit mix is the breakdown of a property by apartment size, such as studios, one-bedrooms and two-bedrooms. The mix affects what rent the property can charge, what renovations cost, and which renters it attracts.
Replacement reserves are money set aside each year for big items that wear out, like roofs, heating systems and appliances. Lenders expect to see this in the numbers even when a seller's records leave it out.
Debt yield is the property's net operating income divided by the loan amount, shown as a percentage. Unlike DSCR, it ignores the interest rate and the amortization schedule, so it does not move when rates move. That is why lenders use it as a floor. It answers what return the lender would earn if it took the property back and had to operate it.
| Metric | What it measures | Why it matters |
|---|---|---|
| Net operating income | Income left after operating costs, before loan payments | The starting point for value and for how much you can borrow |
| Economic vacancy | All rent that goes uncollected | Counting empty units alone makes the property look better than it is |
| Loss to lease | Current rents against market rents | Shows the income available as leases end |
| Expense ratio | Operating costs as a share of income | A quick check on whether costs have been estimated honestly |
| DSCR | Income against annual loan payments | Sets how large a loan the property can support |
| Debt yield | Income against loan amount | How a lender sizes a loan without relying on interest rates |
| Going-in cap rate | Income against purchase price | Whether the price makes sense for the area |
| Exit cap rate | Assumed income against assumed sale price | Often the single biggest factor in the projected return |
| Renovation cost per unit | What it costs to upgrade one apartment | Tells you whether the higher rent is worth the spend |
Fannie Mae's 2026 Fixed-Rate Mortgage Loans term sheet sets a minimum 1.25x DSCR and a maximum 80 percent LTV for conventional properties. Other asset classes and product types carry their own terms, so confirm the applicable execution with your lender.
Every property follows the same four steps. Find out what it earns today. Work out what it could earn under realistic assumptions. Size the loan that income can support. Then name the two or three things that would cause the deal to fail. Apartments differ from other property types mainly in where the income comes from, since it arrives from hundreds of short leases instead of a few long ones.
In underwriting, the T12 is the reality check on every forward-looking number. Each line of a projected budget gets compared against what the property actually earned and spent over the last twelve months, and any difference needs an explanation. Twelve months also covers a full seasonal cycle, which a single month or a trailing-three-month figure will hide.
In commercial real estate underwriting, the rent roll is the starting document. It shows what the property collects today, unit by unit, and when each lease expires, which is what lets you build a forward rent schedule instead of assuming today's income holds. It is also what the T12 gets reconciled against, so an error here moves every number downstream.
In underwriting, loss to lease is how you size the upside without inventing it. You take the gap between current and market rents and spread the capture across the lease expiration schedule rather than assuming it arrives at once. On a value add deal this is usually the number the return depends on.
In underwriting, physical vacancy tells you how many apartments are empty and economic vacancy tells you how much rent is not being collected. Underwrite to the second. It captures unpaid rent, move-in concessions and staff units alongside empty apartments, which is why it reconciles to the T12 and physical vacancy does not.
Fannie Mae's 2026 Fixed-Rate Mortgage Loans term sheet sets a minimum 1.25x DSCR and a maximum 80 percent LTV for conventional properties. Other asset classes and product types carry their own terms, so confirm the applicable execution with your lender.
Underwriting in multifamily is the process of verifying what an apartment property actually earns, rebuilding its expenses at what a new owner will pay, and testing whether the resulting income supports the loan and the return. It differs from other commercial property types because income arrives from hundreds of short leases rather than a few long ones, so it can move materially within a single year.
To underwrite a multifamily property, start from the rent roll and the trailing twelve months of income and expenses, and reconcile the two. Strip out vacancy, unpaid rent and concessions to reach the rent actually collected, then compare those rents against nearby comparable buildings to size the income still available as leases roll. Rebuild taxes, insurance and replacement reserves at what a new owner will pay rather than what the seller paid. The deal works if that income covers debt service at your target DSCR and still clears your return threshold.
