18 Gwynne Road, Melville, NY 11747

18 Gwynne Road, Melville, NY 11747

$5,999,999 · 6 bed · 9 bath · 8,500 sq ft · built 2007 · MLS# 1031747 · Active

Poised behind private gates atop one of Long Island's highest elevations, this extraordinary all-brick manor estate is a masterwork of timeless architecture and uncompromising luxury. Encompassing six lavish bedroom suites, six full baths, and three elegant powder rooms, the residence is surrounded by picturesque English gardens and acres of lush parkland, offering an unrivaled sense of serenity, privacy, and grandeur. Bordering an extensive network of scenic hiking and horseback riding trails, the estate offers a seamless connection to nature, creating an exceptional setting for outdoor recreation and equestrian pursuits. A…

Single-family homes in the Half Hollow Hills Central School District sold for a median of $1,335,000 (typically $925,000–$1,700,000) across 322 recorded sales between Oct 7, 2025 and Oct 2, 2026, up 18.7% on the 12 months before. This home's $5,999,999 list price sits in the luxury single-family tier for the Half Hollow Hills Central School District.

ZIP 11747 has about 3.5 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 $54,088 a year, this home's property tax runs roughly 185% above the $19,000 typical for Half Hollow Hills Central 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

Listings courtesy of OneKey® MLS as distributed by MLS GRID.

Based on information submitted to the MLS GRID as of October 11, 2026 2:30 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

Melville Market Trend

Over the past 2 years, Melville has strengthened — the median sale price has risen roughly 10% year over year to around $1.06M, and homes have generally been selling faster. Sellers currently hold the stronger hand, and if the pattern persists, prices could continue to firm. Alongside that firming trend, note that the roughly $942K blended median combines very different property types, so it may not describe any single one: of 388 recent sales, single-family made up the largest share at about 62% with the highest median near $986K, condos about 38% near $816K. Because condos, though not the most common, is priced far enough from the rest to pull the blend down, the blended figure tends to sit below the single-family median rather than above it — so a typical single-family house has tended to sell closer to $986K, roughly $44K over the headline number. These are past medians, not predictions or guarantees, and individual properties vary widely; anyone weighing a specific property should review current comparable sales for that property type.

Considering Melville? Explore the Melville community guide →

More homes nearby

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.