Portola Valley, CA — Rental Investment Analysis
🔴POOR— negative cash flow likelyData: HUD FMR FY2024 + Zillow ZHVI April 2026 + Freddie Mac rates. Last updated June 2026.
Investment Summary
As of 2026, Portola Valley, CA has a -0.7% cap rate, indicating limited cash flow potential at current prices of $4,338,042 median.
Portola Valley is very expensive relative to rents — expect negative cash flow. At $4,338,042 median home price, Portola Valley requires significant capital. A 20% down payment alone is $867,608. With 3-bedroom rents around $4,450/month, the -0.7% cap rate tells the story. Cash flow is deeply negative at -$25,585/month with standard assumptions. This market requires appreciation to justify the investment.
At 0.10% on the 1% rule, rents are low relative to purchase prices. You'd need a significant discount from asking price to make the numbers work. DSCR of -0.11 is below 1.0, meaning rental income doesn't cover the mortgage. DSCR lenders will likely decline this market at current prices.
Bottom line: At current valuations, Portola Valley doesn't make sense for rental investors focused on returns. Look at lower-cost markets unless you have specific local knowledge.
Data sources: HUD Fair Market Rents (FY2024), Zillow Home Value Index (April 2026), Freddie Mac Primary Mortgage Market Survey.
Cap Rate
-0.7%
Below average
Monthly Cash Flow
-$25,585
After all expenses
Price-to-Rent
81.2
Overpriced for rent
DSCR
-0.11
Fails
Key Metrics
- Median Home Price
- $4,338,042
- Average Rent (3BR)
- $4,450/mo
- Price-to-Rent Ratio
- 81.2(high)
- 1% Rule
- 0.10%(fails — need 1%+)
- Cash-on-Cash Return
- -30.8%
- Vacancy Rate
- 8.0%
Market Strength
- Unemployment Rate
- 5.3%(+1% vs national)
- Rent Growth (YoY)
- +2.9%(national avg)
- Population Growth
- -1.2% YoY
Property Tax Rate
0.71%
of assessed value (CA avg)
Median Income
$84,097
household (CA avg)
Rent-to-Income
63.5%
Stretched
Section 8 Max Rent
$4,450/mo
3BR voucher payment
CA Investor Climate
Landlord Friendly
3/10
State Income Tax
Has state tax
Property Tax
0.71% effective
Population Trend
-1.2% (3yr)