Saint Louis County, MO Cap Rates by Neighborhood

County-Wide Gross Yield: A Starting Point, Not an Answer

At a $293,458 median price and $1,477 monthly rent, Saint Louis County posts a gross yield of 6.04% and a price-to-rent ratio of 16.6x. That number is serviceable relative to most Midwest peers, but it obscures a spread so wide that two properties ten miles apart can land on opposite sides of the cash-flow threshold.

The county runs from Berkeley and Jennings in the north, where median property tax bills are as low as $835 per year, to Clayton in the west, where the same bill can reach $18,955. That difference alone swings net operating income by more than $1,500 per month on a single asset. Underwriting the county average is, in practice, underwriting nothing.

Neighborhood Breakdown by Submarket Tier

North County: High Gross Yield, High Risk

Berkeley and Hazelwood sit closest to Boeing's manufacturing operations. With median tax bills near $835 in Berkeley, the property tax drag on a $150,000 north-county acquisition is about 0.56% of value per year, meaning gross yield does not erode much from taxes alone. On a $150,000 purchase generating $900 per month in rent, the gross yield is 7.2%, and the net yield after a 0.56% tax haircut stays near 6.6%.

The problem is not taxes. Boeing employed about 17,000 workers across its St. Louis County facilities, and the company began 692 Missouri layoffs in January 2025 with union workers rejecting a new contract as of July 2025. A strike or additional cuts would concentrate vacancy and delinquency risk directly in Berkeley and Hazelwood, where blue-collar renter households depend on that payroll. Investors should widen their vacancy assumption to at least 10–12% when modeling north county deals today, which pushes effective net yield well below the headline gross.

Mid-County: The Risk-Adjusted Core

Maplewood, Webster Groves, Kirkwood, and Richmond Heights represent the county's most defensible yield tier. Kirkwood's effective property tax rate runs about 1.19%, below the county median of 1.36%. On a $293,458 median-priced asset, a 1.19% rate means roughly $3,492 per year in taxes, or a 1.19% drag on gross yield, leaving a net yield approaching 4.85% before vacancy and maintenance.

Mid-county submarkets also produced about one-third of total multifamily completions in 2024 and are projected to lead completions going forward, with occupancy stabilizing near 94%. That occupancy rate implies a vacancy drag of roughly 0.36% on gross yield, tightening net yield further to the mid-4% range. For investors comfortable with that spread, mid-county offers a renter profile anchored in young professionals and proximity to existing MetroLink stations at Maplewood and Brentwood, which command a demonstrable transit premium over car-dependent alternatives.

Clayton and West County: Appreciation Play, Not Yield Play

Clayton's median property tax bill reaches $18,955 per year. On a $500,000 Clayton property, that is a 3.79% annual tax rate eating directly into net yield. If the gross yield on that asset is 6.04% by the county median ratio, the tax burden alone consumes 3.79 points, leaving a pre-vacancy, pre-maintenance net yield under 2.3%. That is not a cash-flow position. It is an equity hold, supported by Centene's corporate presence, the World Trade Center St. Louis, and a school and crime profile that sustains price floors through downturns.

Clayton belongs in a portfolio only if the investor is underwriting appreciation and stability, not yield. Saint Ann, at the county's high end for effective tax rates at 1.83%, is a warning label for investors who buy on gross yield without modeling municipality-specific levies.

Neighborhood Comparison Table

Gross yields for Berkeley and mid-county are estimated from the county-wide rent-to-price ratio applied to submarket price ranges from the brief. Clayton gross yield reflects price compression at luxury price points.

Cap Rate Compression vs. Decompression

Prices are not running away from rents in this market, but the relationship has shifted. The Zillow 12-month forward forecast calls for about 2% price appreciation in 2026, while the metro recorded 9.9% price growth year-over-year in early 2026. That deceleration is the key dynamic: prices outran rents through 2024–2025, compressing yields, and the forward pace should allow rents to catch up.

The structural argument for rent growth is the county's multifamily pipeline, projected to reach its lowest level since 2014 in 2025. A shrinking construction pipeline against a renter base that is growing more slowly but not contracting means existing owners hold pricing power. Home sales fell 6.4% year-over-year in March 2026, while active listings rose 14.1% and days on market stretched from 16 to 23 days. That shift gives buyers more room to negotiate entry price, which improves cap rates on new acquisitions without requiring rents to move.

Flood Insurance Adjustment

South county properties near the Meramec River face a separate yield adjustment that does not appear in gross yield calculations. In November 2024, the Meramec at Valley Park was forecast at 32.5 feet against a major flood stage of 25 feet. FEMA is actively updating Flood Insurance Rate Maps for Saint Louis County, with preliminary maps already released for communities including Wildwood. Properties in Valley Park, Fenton, and Eureka that face reclassification into higher flood zones will carry mandatory flood insurance costs on top of standard hazard premiums. For a south county property already working with a mid-4% net yield, an additional $1,200–$2,000 per year in flood insurance can push the effective net yield below 4%.

Investors evaluating south county acquisitions should run a flood zone check against current and preliminary FIRM maps before signing a purchase agreement.

Cap Rate Outlook

The 12–18 month outlook for net yields in Saint Louis County is modestly positive for investors who buy in the right submarket at the right price.

The supply constraint is real: lowest multifamily completions since 2014 supports rent growth, and the county's consistent top-15 national ranking for rent increases is not a one-year anomaly. No county-wide upzoning is planned, which means the supply lid stays on in established residential areas.

The Boeing variable is the single largest near-term risk to north county yields. A strike or second wave of layoffs would stress vacancy rates in Berkeley and Hazelwood faster than any supply or demand cycle. Until the labor situation resolves, north county gross yields need to be 200–300 basis points above mid-county to compensate for that binary risk.

The indefinite delay of the Green Line rail extension, now replaced by a 15-month BRT study, removes a transit-premium catalyst from north corridor properties for several years. Investors who bought anticipating station-area uplift in those corridors should revise their hold period assumptions upward.

Mid-county remains the clearest path to a stable, net-positive yield at 94% occupancy, supported by startup and entrepreneurial activity generating over 50,000 jobs, a healthcare and university anchor in BJC HealthCare and Washington University, and an ADU pathway that allows yield expansion on qualifying lots as small as 5,000 square feet.

Model your specific deal with our investment property calculator to stress-test these yield scenarios against your actual financing terms and target submarket tax rate.