A spec mansion on Miami Beach's San Marco Island went under contract with an asking price of $47.5 million. The deal marked the highest asking price among luxury homes that found buyers in Miami-Dade County the week of Sept. 21-27.

The 10,689-square-foot waterfront estate at 1413 N. Venetian Way sits on a 0.31-acre lot with seven bedrooms, seven bathrooms and one half-bath. Brooklyn-based Maven Construction built the home, which was completed in 2026, according to the Compass listing. The asking price works out to about $4,444 per square foot.

Property records show Maven Construction's Jacek and Olga Skarzynski paid $6 million for the property in 2021, as first reported by The Real Deal. Matthew Crane and Mathieu Rochette of Compass Florida hold the listing.

Waterfront estate features a 10-car understory

The home includes an 8,000-square-foot understory that can hold up to 10 vehicles, a 70-foot knife-edge pool, 12-foot ceilings, dual kitchens, a private elevator and a rooftop deck.

Outside, a 14-foot seawall lines 103 feet of water frontage, and a deep-water dock supports a 30,000-pound boat lift. Annual property taxes are listed at $190,068.

Luxury contract volume dips from prior week

Buyers signed 16 contracts on homes asking $4 million or more that week, totaling $143 million in asking dollar volume, according to the weekly report by Douglas Elliman's Eklund-Gomes team. The previous week logged 26 contracts worth a combined $210.7 million.

Homes that went under contract spent an average of 137 days on the market. Among the 12 single-family deals, the average contract price was $9.8 million, or $1,860 per square foot. The week before, a second San Marco Island property, at 1421 N. Venetian Way, went under contract at an asking price of $16.9 million.

$10 million-plus sales already top 2025 total

Between January and August, Miami-Dade recorded 194 home sales of at least $10 million, 14.1% more than the 170 such sales during all of 2025, according to Miami Realtors + RWorld data reported by Diario Las Américas. Active inventory in the county fell for the seventh consecutive month through August, ending at 15,825 available properties.

No closing date for the San Marco Island estate has been announced.

The buyer's identity has not been disclosed.