129 Southaven Avenue, Mastic, NY 11950

$699,900 · 3 bed · 2 bath · 1,677 sq ft · built 2026 · MLS# 1046895 · Active

To be built Raised-Ranch with actual model to preview. There’s nice 30 or 40 year old homes or….New Modern Custom home features hardwood floors throughout. Crown molding, chair rail and shadow boxes in the living room, dining room and hallway leading to bedrooms.Living room with Fireplace, Ceramic and Porcelin Tiles in the bathrooms. Recessed lighting, Finished room over garage ( F.R.O.G.) white soft closed kitchen cabinets with stainless steel appliances and island Peninsula. Full basement with outside entrance and egress.

Single-family homes in the William Floyd Union Free School District sold for a median of $510,000 (typically $430,000–$580,000) across 494 recorded sales between Oct 6, 2025 and Oct 2, 2026, up 5.2% on the 12 months before. This home's $699,900 list price sits in the luxury single-family tier for the William Floyd Union Free School District.

ZIP 11950 has about 2 months of single family inventory — seller's market. Demand is outpacing supply, so homes sell quickly with firm pricing and limited room to negotiate.

At about $470 a year, this home's property tax runs roughly 94% below the $8,000 typical for William Floyd Union Free School District. Suffolk bills combine town, school and special-district levies, so two homes at the same price in neighboring districts can carry materially different taxes. Exemptions such as STAR, Senior or Veteran move the number as well — a new owner's bill is often not the same as the seller's.

OneKey MLS (recorded LI sales, trailing 12mo) + actual tax