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.
Under contract
Price increase: $100K (6/19)
$1,100,000
317 Tropical Ave, Grassy Key, FL 33050
4beds
1,740sqft
Single Family Residence
Built in 2026
7,405 Square Feet Lot
$1,071,400 Zestimate®
$632/sqft
$-- HOA
What's special
Tile or quartz backsplashCommunity waterfront sunset parkModern faucets and toiletsCorner lotSpray foam insulationLed recess lightingPendant lighting
- 19 days |
- 863 |
- 47 |
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
Originating MLS: Marathon/Lower Keys
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 4
- Bathrooms: 3
- Full bathrooms: 3
Heating
- Central
Cooling
- Central Air, Ceiling Fans(s)
Appliances
- Included: Washer, Disposal, Microwave, Oven, Range, Refrigerator, Dishwasher, Dryer
Features
- Flooring: Vinyl
- Doors: Impact Rstnce Doors
- Windows: Impact Rstnce Window
Interior area
- Total interior livable area: 1,740 sqft
Property
Parking
- Total spaces: 4
- Parking features: Garage, Off Street, Attached
- Has attached garage: Yes
Features
- Patio & porch: Open Porch/Balcony
- Water view: None
- Waterfront features: None, Dockage: None
Lot
- Size: 7,405 Square Feet
- Dimensions: 60 x 125
- Features: Less Than 1/4 Acre
Details
- Parcel number: 00373010000000
- Zoning: RM-1
- Zoning description: Residential Medium - 1
Construction
Type & style
- Home type: SingleFamily
- Property subtype: Single Family Residence
Materials
- CBS, Stucco, Concrete
- Roof: Metal
Condition
- New Construction
- New construction: Yes
- Year built: 2026
Utilities & green energy
- Sewer: Municipal Sewer, Public Sewer
- Utilities for property: FKAA
Green energy
- Energy efficient items: Lighting
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,FHA,Conventional
Estimated market value
$1,071,400
$1.02M - $1.12M
$5,325/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 | $22,500 |
Find assessor info on the county website
Monthly payment
Est. payment$--/mo
Payment breakdown
Explore the cost of this home by adjusting the details. Changes won't be saved.All calculations are estimates and provided by Zillow, Inc. for informational purposes only. Actual amounts may vary.
HOA fees may include property taxes on listings classified as Co-Ops. Contact the listing agent and/or owner for fee details.
Mortgage interest rates are dependent on a number of factors, including credit score, down payment, and repayment length. Interest rate data provided by Zillow Group Marketplace, Inc. as of 1/1/1970 from various mortgage lenders with which we have lead or other similar arrangements; the Estimated Payment is an average of those rates.
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Climate risks
Neighborhood: 33050
Nearby schools
GreatSchools rating
- 5/10Stanley Switlik Elementary SchoolGrades: PK-5Distance: 9 mi
- 5/10Marathon SchoolGrades: 6-12Distance: 8.4 mi
A local agent can set up tours, give advice and negotiate with sellers.
- Florida
- Monroe County
- Marathon
- 33050
- 317 Tropical Ave




