How to Evaluate an Affordable Housing Site Before Underwriting
Underwriting is where you build the model. Site evaluation is where you decide whether it's worth your time to open the spreadsheet.
These are different skills, and confusing them is one of the most common ways lean acquisitions teams burn capacity on deals that shouldn't have made it past the first hour.
This piece is about the pre-underwriting stage — what to actually look for when you're standing in front of a site (or staring at an aerial) and deciding whether to go further.
Start with the subsidy question, not the price
The single most important question in affordable housing site evaluation isn't "what can we pay for this?" It's "what programs might apply here, and do they produce enough subsidy to make the math work?"
This sounds obvious, but most teams default to running a quick proforma before they've confirmed program eligibility. That sequence wastes time. A site that doesn't qualify for the subsidies it needs to be feasible will fail underwriting no matter what the land costs.
Before you build anything, ask:
- Is this market's median income level compatible with the AMI targets the programs require?
- Does the site fall within a Qualified Census Tract (QCT) or Difficult Development Area (DDA) that would boost tax credit equity?
- Are there local set-asides, soft loan programs, or HOME dollars that could layer in?
The subsidy landscape shapes the feasibility ceiling. Start there.
Zoning: the floor, not the ceiling
Zoning tells you what you're allowed to build. It rarely tells you what you should build.
For affordable housing specifically, the gap between as-of-right zoning and what a program requires can be significant — and closing that gap through a variance or rezoning adds time, cost, and political uncertainty to a deal that may already be marginal.
When evaluating a site, separate two distinct questions:
What does current zoning allow? Look at height, density (units per acre or FAR), setbacks, parking minimums, and use permissions. Pay particular attention to whether residential is permitted by-right or conditional.
What does the program require? A 9% LIHTC project in a high-cost urban market may need density that current zoning doesn't support. If you can't get there without a discretionary approval, build that uncertainty into your go/no-go decision — not just your timeline.
Zoning mismatches don't automatically kill sites. But they need to be visible early.
The four things to check before you call the broker back
If you're doing initial site triage — evaluating a dozen potential acquisitions before deciding which three to pursue — here's a practical four-part screen:
1. Program fit. Does the site's location, market context, and likely AMI profile make it compatible with the subsidy programs your team works with? If you primarily do 9% LIHTC, is this a competitive enough location to score well in your state's QAP?
2. Density math. What can you build on this site, and at what unit count does it become feasible for the program you're targeting? Run a rough back-of-envelope: if you need 80 units to make a 9% deal work, does the site support that density given zoning, setbacks, and shape?
3. Site conditions. Are there obvious physical constraints that add cost — environmental history, grade changes, unusual parcel shapes, access issues? These don't need to be fully evaluated at this stage, but red flags should be visible.
4. Competitive context. Is this site likely to attract multiple parties? In competitive allocation states, land basis matters enormously. If you're bidding against a market-rate developer who doesn't need tax credits, you probably can't win on price — and you need to know that before you spend resources.
What to ignore in the first pass
Some things don't matter yet:
- The exact construction cost per square foot (you'll get there in underwriting)
- Detailed environmental conditions (Phase I comes later)
- Specific soft loan terms from the local housing authority (relationship-driven, not desk research)
- The seller's asking price in isolation (meaningless until you know what the deal can support)
The goal of site evaluation isn't to answer every question. It's to eliminate the sites that don't deserve more of your time, and surface the handful that do.
Capacity is the real constraint
Most affordable housing development teams aren't limited by deal flow. They're limited by the capacity to evaluate deal flow seriously.
A senior acquisitions director who spends 15 hours on a site that fails a basic program eligibility check isn't just wasting her time — she's not spending those hours on the site three slots down the list that might have actually worked.
Building a faster, more consistent site evaluation process isn't about doing less due diligence. It's about doing better triage so your real due diligence gets concentrated where it belongs.
Alpha Deal helps affordable housing developers screen sites faster — surfacing program eligibility, zoning constraints, and capital stack scenarios so your team can focus on the deals worth pursuing.