CoStar Comparison · Updated 2026
CoStar is the dominant platform for commercial real estate market data — comps, vacancy trends, rent surveys, cap rate benchmarks, demographic overlays. It's an essential research tool for understanding a market before you invest in it.
But CoStar doesn't underwrite individual deals. It doesn't read your offering memo, extract the financials, or tell you whether a specific property's NOI supports the asking price. That's what Dealyze does. The two tools solve different problems — and they work best together.
Different tools for different stages of the investment process.
| Capability | Dealyze | CoStar |
|---|---|---|
| Primary purpose | Deal-level underwriting | Market data and analytics |
| Market cap rate benchmarks | No | Yes — submarket-level data |
| Rent comps | No | Yes — property-level comps |
| Vacancy trend data | No | Yes — historical and forecast |
| Read & extract from OMs | Yes — AI-powered extraction | No |
| Read T12 / P&L statements | Yes | No |
| NOI / DSCR / cash-on-cash | Automatic from extracted data | No — market averages only |
| Deal-specific IRR | 5-year projection | No |
| Sensitivity analysis | Vacancy + rent scenarios | No |
| Deal grade / Go-No-Go | A-F grade + verdict | No |
| Sales comps | No | Yes — transaction history |
| Cost | From $29/mo | $300-$500+/mo (varies by market) |
How experienced multifamily investors use market data and deal analysis in tandem.
Before you even look at a specific deal, you need to understand the market. What are average cap rates in the submarket? What's the vacancy trend? Are rents growing or flattening? What's the supply pipeline? CoStar excels at answering these macro questions with real data.
This market context helps you set realistic assumptions before you ever open an offering memo. If CoStar says submarket vacancy is 7.2% and trending up, you know to stress-test any deal at 8-10% vacancy, not the 5% the broker assumed in their proforma.
Once a specific deal hits your desk, you need to move from market-level data to property-level underwriting. Upload the offering memo or T12 to Dealyze. The AI extracts the actual financials — gross potential rent, operating expenses, asking price, unit mix — and runs the underwriting model.
Now you can compare the deal's actual metrics to the market benchmarks you got from CoStar. Is this property's cap rate above or below market? Are the per-unit rents in line with comps? Is the expense ratio reasonable for this submarket?
Dealyze lets you adjust every assumption and re-run the model instantly. Use your CoStar market data to set realistic vacancy rates, rent growth assumptions, and expense ratios. If CoStar shows 3% annual rent growth in the submarket, plug that into Dealyze's assumptions instead of the broker's optimistic 5%.
The sensitivity tables in Dealyze show you what happens across a range of scenarios. Cross-reference those scenarios with CoStar's market data to identify which ones are most realistic for the specific submarket.
You already have market data. Now get deal-specific analysis. Upload any offering memo, T12, or rent roll and see the full underwriting report — NOI, DSCR, IRR, sensitivity analysis — in under 2 minutes.