317 Tropical Ave,
Marathon, FL 33050

$999,997

4 Bed |
3 Bath |
1,740 sq ft

New Construction 4 Bedroom 3 Bath Home in Grassy Key | Corner Lot

One of the best new construction values currently available in the Middle Keys, this brand-new 4-bedroom, 3-bath concrete home in Grassy Key offers 1,786 sq ft of elevated living on a private corner lot backing to protected, non-buildable land. Built by the respected local Design Center, the home features solid concrete construction, a seamless metal roof, hurricane-impact windows and doors, spray foam insulation, quartz countertops, luxury vinyl flooring, designer-tiled bathrooms, and a spacious two-car garage. Located in one of Marathon's fastest-growing neighborhoods near a waterfront sunset park and boat ramp, this energy-efficient home delivers modern Keys living with completion expected in December 2026.

Currently in Marathon, Duck Key & Key Colony there is no other New Construction Home available below $1.1M besides this Brand New Under Construction 4 Bed, 3 Bath, 1786 sqft living Concrete Above Flood Home, built by the local well-respected Design Center.

It also happens to be located on a Corner Lot that backups to non-buildable protected land offering more privacy in the Grassy Key neighborhood, which has quickly become a highly desired area for many locals. It's a great family neighborhood with a community waterfront Sunset park and only a mile from a boat ramp.

This home features poured solid concrete 16x16 columns plus an Energy Efficient Seamless Metal Roof, Hurricane Impact Windows & Doors, Spray Foam Insulation along with a High Efficiency 4 Ton A/C System, & even an Electrical Sub Panel Box prewired for a generator hook up. Pre-Cast Concrete Floors allowing for no center columns, which maximizes usable space in the 2 car garage.

Step inside & find Maintenance Free Wide Plank Luxury Vinyl Flooring thru out the home, 8FT High Interior Doors, 9'6'' Ceilings, 5 1/4'' Baseboards, LED Recess Lighting, Modern Fans in each Bedroom & the Living Room, an Open Kitchen with Shaker Soft Close Wood Cabinets with Crown Molding & Hardware including 42'' Uppers, Quartz Countertops including a Large 1 level island, a Tile or Quartz Backsplash, Pendant Lighting, a Full Stainless Steel Appliance Package & Modern Single Sink & Faucet.

All 3 bathrooms feature Designer Tiled Floors, Custom Tiled Showers including LED underlighting and lit shower nooks with the Primary & 1 Guest Bath having Frameless Glass Enclosures & the 2nd Guest having a Tub/Shower Combo. They all have Wood Vanities with Quartz Counters, Modern Vanity Lighting & Mirrors, Modern Faucets & Toilets.

Home comes with a 1-year Builders Warranty and can be offered Furnished by a local interior designer for an additional cost making it Vacation Rental Ready.

ETA for completion is Dec 2026.

Facts & features

  • 4 Beds
  • 3 Baths
  • 1,740 sqft
  • Built 2026
  • 7,500 sqft
  • Corner Lot
  • 2 Car
  • Rear Porch
  • Hurricane Impact Windows
  • Hurricane Impact Doors
  • Marathon
  • Grassy Key

Photo Gallery

317 Tropical Ave
317 Tropical Ave
317 Tropical Ave
317 Tropical Ave
317 Tropical Ave
317 Tropical Ave