For sale Home

Listed Sep 12, 2025

$4,650,000 Est. $30,756/mo

3742 Seagrape Street

  • 3

    Beds

  • 3

    Baths

  • 4,687

    Sq ft

The story

  • Pool
  • Waterfront

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.

Facts & features

Home type

Home

Year built

2014

Floors

2

Price per sq ft

$992

Parking

4-car garage

Included features

  • Pool

    Yes

  • Cooling

    Central Air

  • Heating

    Central

  • Appliances

    Dishwasher, Electric Water Heater, Disposal, Microwave

  • Flooring

    Tile

  • Roof

    Concrete

  • Lot Information

    One To Two Acres

  • Exterior

    Balcony, Security High Impact Doors, Lighting

  • Water Source

    Public

  • Sewer

    Public Sewer

  • View

    Water

Mortgage calculator

Estimated monthly payment

$30,756 /mo

7% rate · 30-yr fixed · 20% down

  • Principal & interest $24,749
  • Property tax $4,650
  • Insurance $1,356

Includes principal, interest, taxes & insurance.

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Listing Broker

Ocean Sotheby's International

Broker Name

Ocean Sotheby's International

Agent

Jo Ann Cook

Location

Marathon FL 33050