How Do I Read a Multifamily Rent Roll? (Spot Red Flags Before You Buy)
The rent roll is the single most important document in multifamily investing—it reveals whether you're buying an income-producing asset or an expensive problem disguised as opportunity. After reviewing hundreds of rent rolls across 13+ years in LA County real estate, I've learned that most investors make critical errors.
They trust seller-provided summaries without verifying actual leases, miss the difference between AB 1482 markets (where long-term below-market tenants naturally turn over in 3-5 years at zero cost) and RSO markets (where those same tenants require $10,650-$26,550 each in relocation fees to remove), and fail to spot payment history red flags that indicate poor management or problem tenants.
This guide teaches you to read rent rolls line-by-line to identify: (1) below-market rents that represent genuine opportunity vs expensive traps, (2) qualified tenant status in RSO markets that can cost $100K+ to resolve, (3) payment problems indicating tenant quality issues, (4) fraud patterns where sellers inflate rents or fabricate tenants to manipulate property value.
The Cap Rate Formula
Real Example: Alhambra Fourplex
Seller's tax bill might show $12,000 (based on old assessed value). YOUR taxes will be $19,800 at $1.8M purchase price. This $7,800 difference destroys cash flow if ignored. Always calculate taxes at 1.0-1.25% of YOUR purchase price, not seller's current bill.
LA County Cap Rate Ranges by Market Tier
Cap rates vary dramatically by location, reflecting appreciation potential, tenant quality, and rent control risk.
Current vs Stabilized Cap Rates
This distinction is CRITICAL in AB 1482 markets with below-market rents.
Year-by-Year Progression: Alhambra Fourplex
Starting rents $200/unit below market in AB 1482 market:
| Year | Gross Income | NOI | Cap Rate | Notes |
|---|---|---|---|---|
| Year 0 | $86,400 | $23,400 | 1.3% | Purchase with below-market rents |
| Year 1 | $93,300 | $28,300 | 1.6% | 8% rent increases applied |
| Year 2 | $98,800 | $32,800 | 1.8% | 2 units turn to market |
| Year 3 | $103,200 | $35,200 | 2.0% | 1 more unit to market |
| Year 4 | $106,000 | $38,000 | 2.1% | All units at market |
| Year 5 | $110,000 | $42,000 | 2.3% | Market rents grew |
This property's NOI increased from $23,400 to $42,000 over 5 years—a $18,600 increase. At a 4.5% exit cap rate, that's $413,333 in added value from rent stabilization alone, before any market appreciation.
AB 1482 vs RSO: $250K+ Valuation Difference
Same property, same rents, completely different cap rate analysis based on rent control type.
- Current cap rate: 1.22% (below-market rents)
- Stabilized cap rate: 1.83% (Year 4-5)
- Rents reach market via natural turnover
- Relocation costs: $0
- Timeline to stabilization: 3-5 years
- Fair value at $1,600,000
- Current cap rate: 1.22% (same as AB 1482)
- Cannot calculate stabilized cap rate
- Market rents require expensive buyouts
- Relocation costs: $42,600-$106,200 (4 units)
- Timeline: 8-15 years minimum
- Fair value at $1,350,000 (if willing to hold)
Identical property with same current income trades $250K higher in AB 1482 markets vs RSO markets due to stabilization potential. This is why understanding rent control jurisdiction is critical BEFORE calculating cap rates.
Browse AB 1482 Markets with $250K+ Valuation Advantage
See properties in markets where stabilization creates value through natural turnover
7 Common Cap Rate Calculation Errors
Reverse Engineering Fair Value
Once you know how to calculate cap rate, you can reverse the formula to determine what a property SHOULD sell for:
Example: Overpriced Property
Determine your target cap rate for the market tier → Calculate fair value using verified NOI → Deduct repair costs → Deduct value for deferred maintenance → Result is your maximum offer price. Don't let emotions or "winning the deal" push you above this number.
Related Resources
Ready to Calculate Cap Rates on Real LA County Properties?
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Practice Your Cap Rate Formula on Live LA County Properties
Apply what you learned: Calculate NOI, determine fair value, analyze current vs stabilized cap rates
