3742 Seagrape St

Big Pine, FL 33043

$4,650,000

$992/ft²

3Beds

3Baths

4,687Sq ft

2014Year built

Single-family homeType

About this home

Escape to “The Castle”, a luxurious gated Gulf-front estate spanning 1.14 acres on Big Pine Key. Built in 2014 with poured concrete, impact windows/doors, elevator, and generator, this 4,600+ sq. ft. masterpiece offers 3 bedrooms, 3 baths, and breathtaking Gulf views. Boaters enjoy 235’ of dockage: 140’ protected canal dock with lift, ramp, and slip, plus 95’ open-water pier dock with lift and seawall. Inside, a chef’s kitchen with 10.5’ island, dual sinks, Jenn-Air gas range, and wood cabinetry flows to a grand family room, theater, and rooftop deck. The top-floor primary suite boasts water views, office, lounge, spa bath, and custom closet. Outside, a resort-style pool with spa, heater/chiller, and LED lighting completes this rare Florida Keys retreat.

Features

Waterfront

Property details

Listing

MLS #: A11877495
Status: For sale
Listed on: Apr 28, 2025
Days on market: 468 days
Listing data updated: Aug 9, 2026

Interior

Beds: 3
Baths: 3
Living area: 4,687 ft²
Price per ft²: $992/ft²

Building & community

Type: Single-family home
Year built: 2014
County: Monroe

Lot & exterior

Lot size: 17,260 ft²
Waterfront: Yes

Days on market, price per ft² and the monthly HOA amount are calculated by this site from the MLS data shown; the association fee is normalized to a monthly figure.

True monthly cost

Mortgage (principal & interest): $23,513
Property taxes (est.): $4,263
Home insurance (est.): $600
Flood insurance (est.): —

Estimated total$28,376*/mo

* Some cost lines aren't available yet for this listing; the total shown is incomplete.

Based on 20% down, a 6.5% rate and a 30-year loan, plus this home's estimated Florida carrying costs. All figures are illustrative estimates — not quotes, not financial or insurance advice.

Sources: flood zone — FEMA National Flood Hazard Layer; mortgage, taxes and insurance figures — this site's own estimates; HOA / CDD — as reported for this listing.

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