ZIP CODE 20878 // WASHINGTON-ARLINGTON-ALEXANDRIA, DC-VA-MD-WV // DATA AS OF 2026-09-30
Gaithersburg, MD (20878) Rental Property Cap Rate & Cash Flow Report
Located in Montgomery County (Gaithersburg, MD), Zip Code 20878 ranks #403 of 500 within this selected sample (20th percentile) with a Zillow ZHVI typical home-value index of $680,693 (-0.6% YoY) and a ZORI observed market rent of $2,384/mo (+1.2% YoY). Requires at least 71.2% down payment at 6.5% interest to reach $0/mo break-even cash flow. This model combines different housing populations; it is not an observed average property return. Costs assume state-average tax, 0.5% annual insurance, 13% reserves and no HOA or management. Figures below follow your edits; this headline describes the original benchmark.
Net Monthly Cash Flow
-$2,202/mo
Annual: -$26,420/yr
Modeled Cap Rate
2.19%
NOI: $14,883/yr
Cash-on-Cash Return
-16.88%
Cash Needed: $156,559
1% Rule Ratio
0.35%
Gross Yield: 4.20%
Break-Even Rent
$4,915/mo
State Tax: 0.97%/yr
INTERACTIVE PRO-FORMA STATEMENT (ZIP 20878 BENCHMARK)
Edit any value
Purchase Price (ZHVI proxy)
Monthly Gross Rent (ZORI proxy)
Down Payment (%)
Interest Rate (30Y Fixed %)
Annual Property Tax (MD Avg 0.97%)
Annual Home Insurance ($)
Monthly HOA Fee ($)
Monthly Debt Service (P&I)
-$3,442/mo
Monthly Operating Expenses (Tax + Ins + 13% Reserves)
-$1,144/mo
HISTORICAL ZHVI PRICE VS. ZORI RENT TRAJECTORY (20878)
| Year | ZHVI Value | ZORI Rent | Gross Yield |
|---|---|---|---|
| 2021 | $605,686 | $2,021/mo | 4.00% |
| 2022 | $637,725 | $2,162/mo | 4.07% |
| 2023 | $654,760 | $2,256/mo | 4.13% |
| 2024 | $683,352 | $2,332/mo | 4.10% |
| 2025 | $684,977 | $2,356/mo | 4.13% |
| 2026 | $680,693 | $2,384/mo | 4.20% |
COMPARABLE U.S. RENTAL MARKETS
| Zip / City | Price | Rent | Cap Rate | Cash Flow |
|---|---|---|---|---|
| 20906 Silver Spring, MD | $436,799 | $1,979/mo | 3.26% | -$1,022/mo |
| 21740 Hagerstown, MD | $288,533 | $1,328/mo | 3.33% | -$657/mo |
| 20874 Germantown, MD | $408,788 | $1,994/mo | 3.62% | -$833/mo |
| 21117 Owings Mills, MD | $384,367 | $1,877/mo | 3.63% | -$781/mo |
| 21234 Parkville, MD | $300,360 | $1,621/mo | 4.16% | -$476/mo |
| 21122 Pasadena, MD | $450,783 | $2,538/mo | 4.41% | -$624/mo |