Suffolk County, NY Cap Rates by Neighborhood

County-Wide Gross Yield: A Starting Point, Not a Conclusion

At the county-wide level, Suffolk County delivers a computed gross yield of 6.61% against a median home price of $716,259 and a median rent of $3,948 per month. That number looks serviceable on paper. It is not.

The 6.61% gross yield assumes zero vacancy, zero property management, zero maintenance, zero insurance, and zero taxes. Once you layer in Suffolk's actual carrying costs, that headline number collapses. The county's effective property tax rate sits at 2.42% of market value. On a $716,000 acquisition, that is $17,327 in annual property taxes alone, consuming 263 basis points of your gross yield before you touch any other expense line. A conservative 40% expense ratio (taxes, insurance, maintenance, vacancy, management) on a $716,000 property generating $47,376 in gross annual rent leaves a net operating income of about $28,426, producing a net cap rate closer to 3.9%. At current financing rates, that is deeply negative carry.

The aggregate, therefore, is primarily useful as a ceiling. The real analysis lives in sub-market selection, asset segment, and flood zone exposure.

Property Tax: The Most Consistent Cap Rate Killer

The math is worth running twice because it is that punishing. Suffolk County's median annual tax bill is $9,472 on a median-priced home, and 125 separate school districts create a wide band of variation. Two comparable homes on adjacent streets in different districts can carry tax bills several thousand dollars apart annually. On a $429,000 Mastic Beach purchase at the same 2.42% effective rate, taxes run about $10,382 per year. On a $725,000 mid-county single-family home, you are looking at closer to $17,545. That differential directly moves your net cap rate by 100–150 basis points depending on where you buy.

Investors must pull the actual tax bill at the parcel level, not rely on county averages. The school district allocation exceeds 60% of the total bill, so a district boundary change or reassessment cycle can reprice your underwriting after acquisition.

Neighborhood and Segment Breakdown

Suffolk County spans 104 cities and hamlets with a median listing price range of $429,000 (Mastic Beach) to $7,250,000 (Bridgehampton). Three distinct investment segments emerge from the data.

Hamptons and East End Luxury Corridor

Bridgehampton at a $7,250,000 median represents the east end luxury tier. Gross yields here compress well below the county average because price appreciation, not rental income, drives total return. The Signature Aviation expansion at Gabreski Airport in Westhampton Beach, a $48 million project, signals continued institutional and high-net-worth capital flows into the eastern corridor. Short-term and seasonal rental demand supports revenue at the high end, but net cap rates for long-term hold strategies are likely in the 2.0–2.5% range after taxes and carrying costs. This is a pure appreciation and luxury-demand thesis.

Mid-County Workforce and Commuter Markets

Smithtown, Huntington, Islip, Patchogue, Stony Brook, and Babylon represent the most liquid mid-tier sub-markets. These areas sit within reasonable reach of both LIRR commuter service and the Hauppauge Industrial Park (1,300+ companies, 55,000+ workers). Healthcare and education, which together employ 223,189 workers county-wide, are the dominant demand drivers here. Homes in these markets transact closer to the $600,000–$725,000 range, and gross yields track nearer to the county median of 6.61%.

The Port Jefferson branch electrification legislation (A8560A) passed the State Assembly in June 2025 and covers north-shore communities including Smithtown and Stony Brook. Electrification improving speed and reliability would widen the effective commuter catchment area, supporting both rent levels and price appreciation in those specific corridors.

Affordable East-County and South Shore Markets

Mastic Beach at about $429,000 is the most affordable entry point in the county and carries the highest nominal gross yield of the named markets. On a $429,000 acquisition at $3,948 median county rent (likely lower in practice here, but using the floor as a test), gross yield already exceeds 11% in theoretical terms. After taxes at 2.42% ($10,382), insurance, and vacancy, net yield still likely clears 5.5–6.5% for a competent operator. That is the closest thing to cash-flow-positive territory in Suffolk County. The offset is flood risk: Mastic Beach carries the highest flood zone exposure in the entire county. First Street data projects 25% of Suffolk properties face major flood risk over 30 years, with risk accelerating faster than the national average. Mastic Beach concentrates that risk. Flood insurance premiums, which FEMA's revised Flood Insurance Rate Maps (going into effect June 2026) could reset upward after reclassification, must be explicitly modeled. A $3,000–$5,000 annual flood insurance premium on a $429,000 property removes 70–120 basis points from net yield.

Neighborhood Comparison Table

*Mastic Beach net cap rate is flood-insurance-adjusted. Actual range depends on FEMA reclassification post-June 2026 and specific parcel flood zone designation.

Cap Rate Compression vs. Decompression

Home prices rose 2.88% year-over-year on the ZHVI. The county's inventory fell 10% year-over-year to 2.7–2.8 months, and homes sold at 100.7%–103.3% of list price with a median of 27 days on market. If rent growth is not outpacing that 2.88% price appreciation, cap rates are compressing. The current 15.1x price-to-rent ratio reflects a market where buyers are pricing in future appreciation rather than current income. As long as inventory stays suppressed (well below the 5–6 month balanced-market threshold), price appreciation should continue to outrun rent growth, keeping cap rates under pressure. There is no imminent decompression catalyst visible in the data.

The 82.2% homeownership rate structurally limits rental supply, which does give landlords real pricing power on rent. But that same dynamic is what keeps acquisition prices elevated and gross yields from expanding.

Cap Rate Outlook

Two transit investments are the clearest forward-looking cap rate catalysts. The Yaphank LIRR station, targeting completion in Q2 2026, tightens the transit link between eastern Suffolk and Brookhaven National Laboratory, where employment is stable and federally funded. Properties within a reasonable drive of the relocated station should see incremental demand. The Port Jefferson electrification bill, if it advances through the full legislative process, would be a multi-year positive for north-shore corridor cap rates because improved commute reliability draws a wider pool of NYC-dependent renters and buyers.

FEMA's revised flood maps going into effect June 2026 represent the clearest near-term risk to net yields on coastal properties. Any parcel currently outside a Special Flood Hazard Area that gets reclassified into one will face new mandatory flood insurance requirements on federally-backed mortgages, adding a carrying cost that was not in the acquisition underwriting.

The ADU pipeline adds an optionality layer. New York State's $85 million Plus One ADU Program and pending statewide legislation (A4854) could allow investors in Suffolk's single-family stock to add a rental unit. On a $700,000 property, a secondary unit generating $1,800–$2,000 per month adds 3.1–3.4% to gross yield, potentially pushing blended net cap rates above 5% in select mid-county locations. Town-level permitting still governs today, with the Town of Islip allowing accessory apartments on lots of 7,500 sq ft or more.

Suffolk County is not a cash-flow market at current prices and rates for most leveraged buyers. It is a long-term equity appreciation market with one affordable sub-market (Mastic Beach) that trades cash-flow proximity for flood risk, and one transit-driven appreciation corridor (north shore / Port Jefferson branch) that warrants close attention through 2026–2027.

Model your specific deal with our investment property calculator to stress-test tax burden, flood insurance costs, and financing assumptions against your target neighborhood.