1 Sunken Valley Drive, Mount Sinai, NY 11766
$1,399,999 · 5 bed · 4 bath · 3,400 sq ft · built 2027 · MLS# 1061070 · Active
Luxury new construction to be built in 2027 at 1 Sunken Valley Drive, Mount Sinai, situated on .70 acres on a cul-de-sac. This thoughtfully designed Colonial offers approximately 3,400 square feet of living space with five bedrooms, three full bathrooms, and one half bath, plus a full basement and attached two-car garage. The proposed exterior pairs crisp white siding with stone accents, contrasting black windows, and a covered front entry for striking curb appeal. Inside, a dramatic two-story foyer welcomes you to a spacious layout featuring a formal dining room,…
Single-family homes in the Mount Sinai Union Free School District sold for a median of $800,000 (typically $710,000–$985,000) across 104 recorded sales between Oct 14, 2025 and Sep 30, 2026, up 4.6% on the 12 months before. This home's $1,399,999 list price sits in the luxury single-family tier for the Mount Sinai Union Free School District.
ZIP 11766 has about 2.3 months of single family inventory — seller's market. Demand is outpacing supply, so homes sell quickly with firm pricing and limited room to negotiate.
OneKey MLS (recorded LI sales, trailing 12mo) + actual tax

Listings courtesy of OneKey® MLS as distributed by MLS GRID.
Based on information submitted to the MLS GRID as of October 12, 2026 3:30 am. All data is obtained from various sources and may not have been verified by broker or MLS GRID. Supplied Open House Information is subject to change without notice. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information.
Personal-use terms and which listings this site shows: MLS & Data Disclosures
Mount Sinai Market Trend
Over the past 2 years, Mount Sinai has softened — the median sale price has eased about 1% year over year to around $776K, and homes are taking longer to sell. If this trend continues, conditions could keep easing toward a more balanced market.
Considering Mount Sinai? Explore the Mount Sinai community guide →
More homes nearby
- All homes for sale in Mount Sinai, NY
- Homes for sale in Suffolk County, NY
- All Long Island & NYC listings
- Homes in ZIP 11766
Looking for off-market opportunities or a property attorney's read on this listing? Contact Joseph DeVito — Lic. R.E. Associate Broker + NY-licensed real estate attorney.
