When you're scanning deal flow and a 200-unit apartment complex hits your inbox at $18M, the first question isn't "is that a good price?" — it's "good price compared to what?" That's where price per square foot and price per unit come in, and knowing which one to reach for can save you from misleading comparisons.
Price per Square Foot: The Universal Yardstick
Price per square foot (price per SF) is the most widely used metric in commercial real estate. The formula is straightforward:
Price per SF = Purchase Price ÷ Total Square Footage
A 50,000 SF office building selling for $10M comes out to $200/SF. Simple enough.
Price per SF works across nearly every asset class — office, retail, industrial, and multifamily — which makes it the default for quick comp analysis. It normalizes for building size, so you can compare a 10,000 SF strip center against a 40,000 SF retail box in the same submarket.
When price per SF shines:
- Comparing assets of different sizes within the same type
- Office, retail, and industrial deals where square footage drives value
- Benchmarking against market averages (most published data uses $/SF)
- Lease analysis — rental rates are almost always quoted per SF
Price per Unit: The Multifamily Standard
Price per unit (also called price per door) takes a different approach:
Price per Unit = Purchase Price ÷ Number of Units
That same $18M apartment complex with 200 units? That's $90,000 per door.
In multifamily, price per unit is often more useful than price per SF because unit count directly ties to revenue potential. A 200-unit property generates roughly 200 rent checks — regardless of whether those are 600 SF studios or 1,200 SF three-bedrooms.
When price per unit is the better choice:
- Multifamily acquisitions (apartments, student housing, senior living)
- Self-storage facilities (price per door/unit)
- Hotel transactions (price per key)
- Quick screening of deal flow when unit mix varies
In multifamily, always look at price per unit and price per SF together. A property at $90K/door sounds cheap — until you realize they're 500 SF studios. The $/SF might tell a different story.
Side-by-Side Comparison
| Factor | Price per SF | Price per Unit | |--------|-------------|----------------| | Best for | Office, retail, industrial | Multifamily, hotels, storage | | Normalizes for | Building size | Revenue units | | Published comps | Widely available | Mainly multifamily/hospitality | | Lease connection | Direct (rents quoted $/SF) | Indirect | | Weakness | Ignores unit count/mix | Ignores unit size differences |
Common Mistakes
1. Using Only One Metric
Neither metric tells the full story alone. A multifamily deal at $75K/door in a Class B submarket sounds attractive — but if those units average 1,400 SF, your price per SF might be well above market. Always cross-check.
2. Mixing Gross and Net SF
Price per SF comparisons break down when one deal uses gross square footage and another uses net rentable. Office buildings with high common-area factors are especially prone to this. Make sure you're comparing apples to apples.
3. Ignoring the Income Approach
Both metrics are comparison tools, not valuation methods. They help you screen and benchmark, but the actual investment decision should be driven by NOI, cap rates, and cash flow analysis. A property can look cheap on a per-SF basis and still be a terrible deal if the income doesn't support the price.
4. Cross-Market Comparisons Without Context
$200/SF means very different things in downtown Dallas vs. Manhattan. Per-unit pricing varies just as wildly. Always anchor to the local submarket.
Which Metric Should You Lead With?
Here's a practical framework:
- Office, retail, industrial: Lead with price per SF. It's how the market thinks, how brokers quote, and how comps are reported.
- Multifamily: Lead with price per unit, but always validate with price per SF. The best investors look at both.
- Hotels: Price per key (the hospitality version of price per unit).
- Self-storage: Price per SF for the building, but price per unit for individual storage bays.
- Mixed-use: This is where it gets messy. Break the property into components and apply the right metric to each.
Putting It Into Practice
When you're processing dozens of deals from broker blast emails, you need to screen fast. Pick the right primary metric for the asset class, set your submarket benchmarks, and filter ruthlessly.
For example, if you're focused on Dallas multifamily:
- Know that Class B garden-style apartments are trading around $100-140K/door
- Anything significantly below that range warrants a closer look (value-add opportunity or red flag?)
- Anything significantly above suggests renovated/stabilized product — does the rent roll justify it?
The goal isn't to make a buy decision from a single metric. It's to separate the deals worth underwriting from the ones that aren't — before you spend hours on due diligence.
Key Takeaways
Price per SF and price per unit are both screening tools. Neither replaces proper underwriting. The skill is knowing which to reach for first based on the asset class, then cross-checking with the other to catch what you might miss.
The best CRE professionals don't pick one — they use both, quickly, to cut through the noise in their inbox and focus on deals that actually pencil.
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