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 ¼'' 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.
Under contract
$1,100,000
317 Tropical Ave, Grassy Key, FL 33050
4beds
1,740sqft
Single Family Residence
Built in 2026
7,405 Square Feet Lot
$1,074,300 Zestimate®
$632/sqft
$-- HOA
What's special
Tile or quartz backsplashCommunity waterfront sunset parkModern faucets and toiletsCorner lotSpray foam insulationLed recess lightingPendant lighting
- 144 days
- 18
- 0
Zillow last checked:
Listing updated:
Listed by:
Kenny L. Matlock 305-849-5582,
No Nonsense Real Estate Branch Office,
Chris Cioffi 239-410-5099,
No Nonsense Real Estate Branch Office
Source: FLKMLS,MLS#: 620206
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 4
- Bathrooms: 3
- Full bathrooms: 3
Heating
- Has Heating (Unspecified Type)
Cooling
- Central Air, Ceiling Fans(s)
Appliances
- Included: Washer, Dryer, Dishwasher, Refrigerator, Range, Oven, Microwave, Disposal
Features
- Flooring: Vinyl
Interior area
- Total structure area: 1,740
- Total interior livable area: 1,740 sqft
Property
Parking
- Parking features: Attached
- Has attached garage: Yes
Features
- Patio & porch: Open Porch/Balcony
Lot
- Size: 7,405 Square Feet
- Dimensions: 60 X 125
Details
- Parcel number: 00373010000000
- Zoning: RM-1 - Residential Medium - 1
Construction
Type & style
- Home type: SingleFamily
- Property subtype: Single Family Residence
Materials
- CBS, Concrete, Stucco
Condition
- New Construction
- New construction: Yes
- Year built: 2026
Community & HOA
Community
- Features: Other
- Subdivision: Crains Sub (58.0)
HOA
- Has HOA: No
- Services included: None
Location
- Region: Grassy Key
Financial & listing details
- Price per square foot: $632/sqft
- Tax assessed value: $45,000
- Annual tax amount: $500
- Date on market: 6/8/2026
- Listing terms: Cash,Conventional,FHA
Estimated market value
$1,074,300
$1.02M - $1.13M
$5,310/mo
Price history
| Date | Event | Price |
|---|---|---|
| 6/19/2026 | Contingent | $1,100,000$632/sqft |
Source: | ||
| 6/19/2026 | Price change | $1,100,000+10%$632/sqft |
Source: | ||
| 6/8/2026 | Listed for sale | $999,997+400%$575/sqft |
Source: | ||
| 11/18/2025 | Sold | $200,000-27.3%$115/sqft |
Source: | ||
| 11/14/2025 | Pending sale | $275,000$158/sqft |
Source: | ||
| 11/3/2025 | Contingent | $275,000$158/sqft |
Source: | ||
| 8/8/2025 | Price change | $275,000-15.4%$158/sqft |
Source: | ||
| 5/6/2025 | Listed for sale | $325,000+333.3%$187/sqft |
Source: | ||
| 3/2/2022 | Sold | $75,000+66.7%$43/sqft |
Source: Public Record Report a problem | ||
| 2/5/2004 | Sold | $45,000+150%$26/sqft |
Source: Public Record Report a problem | ||
| 3/14/2003 | Sold | $18,000$10/sqft |
Source: Public Record Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | $500 -4.3% | $45,000 |
| 2024 | $523 -26.2% | $45,000 -29.4% |
| 2023 | $708 +52% | $63,750 +383% |
| 2022 | $466 +95.2% | $13,200 +10% |
| 2021 | $239 -9.1% | $12,000 -17% |
| 2020 | $263 | $14,466 -3.6% |
| 2019 | $263 +3.2% | $15,000 -6.3% |
| 2018 | $254 +3.5% | $16,000 |
| 2017 | $246 +2.6% | $16,000 -59.4% |
| 2016 | $240 -24.9% | $39,375 +75% |
| 2015 | $319 | $22,500 |
Find assessor info on the county website
Monthly payment
Est. payment





