Monroe County, Florida
Sell your land in Grassy Key for cash
Parcel Buyers buys vacant lots and land for cash in Grassy Key, including parcels without an active water or sewer connection and lots that still need BPAS and flood review. You get a written, no-obligation cash offer within 24 hours, and closings run through an independent title company, typically in about 10 days, with no fees or commissions.
By Parcel Buyers · · Lot figures from the 2026 Florida property tax roll · How we made this page
Quick answers
- Who buys land for cash in Grassy Key?
- Parcel Buyers is a direct land buyer that makes written, no-obligation cash offers on vacant lots and acreage in Grassy Key, Monroe County, usually within 24 hours. Sales close through an independent title company, typically in about 10 days, with no fees or commissions to the seller.
- How many vacant lots are in Grassy Key?
- The 2026 Florida property tax roll lists 171 vacant residential lots in Grassy Key; 60% are standard city lots, and the median lot is 0.17 acre.
- How is a cash offer for land in Grassy Key set?
- We start from recent sales of similar lots nearby, like the 2025 prices on this page, then adjust for water and sewer, road access, flood zone, lot size and any title issues, and for the time and cost of reselling. You get one written number, not a range.
- How do I know a land buyer in Grassy Key is legitimate?
- A real buyer closes through an independent, licensed title company and never asks you to pay anything up front. We never charge sellers a fee, deposit or closing-cost advance, and the title company pays you by check or wire at closing.
- How many vacant lots in Grassy Key got a home on the tax roll in 2025?
- 6 vacant lots in Grassy Key changed from vacant-residential use to a home with new-construction evidence on the 2026 preliminary tax roll.
Local data
Grassy Key land at a glance
Tax-roll figures cover parcels whose property address city is Grassy Key in Monroe County. Local rules and services are sourced below.
| Vacant residential lots | 171 parcels classified vacant residential on the 2026 tax roll [1] |
|---|---|
| Most common lot size | Standard city lot (7,000–9,000 sq ft): 60% of vacant lots; next, patio-home lot at 10%. Median lot: 0.17 acre (7,500 sq ft). [1] |
| Typical assessed value | $11,800 median just (market) value for a vacant lot; the middle half fall between $11,800 and $114,300 [1] |
| Recent lot sale prices | Too few arm's-length vacant-lot sales in 2025 to report a reliable median for Grassy Key [1] |
| Inside the City of Marathon | Grassy Key is inside incorporated Marathon, which formed in 1999 and runs from about mile marker 47 to 60. The city Building Department, not unincorporated Monroe County, handles permits. [2],[3] |
| BPAS limits new homes | Every new residential structure needs a BPAS allocation. The current schedule awards allocations twice yearly: 12 total in even years and 15 total in odd years. [4] |
| City sewer Service Area 7 | Marathon wastewater Service Area 7 runs from Fat Deer Key East through Grassy Key. After a connection, an old septic system must be converted or abandoned with health approval within 180 days. [5],[13] |
| Wastewater assessment roll | For fiscal year 2025-26, Service Area 7 parcels still on the adopted roll can be assessed up to $415 per EDU plus $93 per connection, a $508 total for one of each. [6] |
| Vacant-lot stormwater charge | The city says its stormwater program includes vacant property. For fiscal year 2025-26, residential, nonresidential and unimproved property on the roll is billed at $120 per ERU. [7],[8] |
| Aqueduct water charges | FKAA supplies Keys drinking water. Effective October 1, 2026, an active 5/8-inch meter has a $26.81 monthly base charge; the residential system development charge for that meter is $5,722. [11],[12] |
| Coastal floodplain rules | Marathon identifies the whole city as coastal floodplain. In a VE coastal high-hazard zone, city code bars structural fill and requires a sealed V-zone design certification. [9],[10] |
| Curry Hammock State Park | The 1,112.5-acre state park includes part of Grassy Key and is managed for outdoor recreation and conservation. Its boundary is a key parcel-location check. [14] |
| Vacant lots that got a home on the tax roll in 2025 | 6 recorded with new-construction evidence. [1] |
| 2026 so far (Jan-Jun) | County-level for Monroe County: 43 recorded vacant-lot sales; median $268,000. [1] |
Pricing
What is a lot in Grassy Key worth?
These are open-market sale prices. A direct cash offer is usually lower, because a cash buyer closes in days and takes on the time and cost of reselling the lot.
See what similar lots sold for
What moves the price in Grassy Key
A house needs a scarce BPAS allocation
A vacant residential parcel does not automatically carry permission for a new house. Marathon says every new residential structure needs an allocation through BPAS, its Building Permit Allocation System. Awards occur twice a year. The current schedule provides 12 total allocations in even years, including 9 market-rate allocations, and 15 total in odd years, including 12 market-rate allocations. A parcel that already has an allocation is therefore at a different permitting stage from a lot that must enter and score in a future period. [4]
Sewer, stormwater and water charges affect the budget
Utility status affects both development cost and the annual carrying record. Grassy Key is in Marathon wastewater Service Area 7. For fiscal year 2025-26, a parcel still on that assessment roll can be charged up to $415 per EDU and $93 per connection. EDU means the billing unit for one equivalent dwelling. The city also bills stormwater at $120 per ERU, the drainage billing unit, and says vacant property is included. For a future active 5/8-inch water meter, FKAA lists a $5,722 system development charge and a $26.81 monthly base effective October 1, 2026. The parcel tax bill and utility records show which existing balances or connections apply. [5],[6],[7],[8],[12]
Flood zone changes the usable building plan
Flood review is part of the buildability question across Grassy Key because Marathon identifies its entire city as coastal floodplain. A specific parcel can still have different mapped hazards and base flood elevation from the lot across the road. In a VE coastal high-hazard zone, the city code does not allow structural fill. New construction documents must include a V-zone certification prepared and sealed by a registered design professional. Elevation, foundation design, shoreline position and the amount of buildable area can therefore matter more than tax-roll lot size alone. [9],[10]
Small lots sit beside protected park property
Parcel boundaries matter because Curry Hammock State Park includes a portion of Grassy Key. The state management plan puts the park at 1,112.5 acres and says its primary purpose is outdoor recreation and conservation. That does not mean a private Grassy Key address is park land, but it makes a boundary check important before assuming every vacant-looking tract is available for private development. In the property-address scope used on this page, the median vacant residential lot is 0.17 acres, about 7,500, and standard city lots make up 60%. The median tax-roll just value is $11,800, with a middle half of $11,800–$114,300; those tax values do not establish buildability or a sale trend. [14],[1]
Common situations
Selling land in Grassy Key in these situations
You inherited a small island lot
Yes. You can sell an inherited lot even if the family never pursued a building allocation or utility connection. Parcel Buyers checks utilities, access and title before offering. An independent, licensed title company handles the closing, and liens or back taxes can be paid from the sale proceeds with the seller's consent. The tax-roll size category is only a starting point; BPAS status, flood design and the park boundary are separate questions for the correct public records. [4],[9],[14],[1]
The parcel still carries city assessments
Yes. A lot can be sold while wastewater or stormwater assessments still appear on its record. Fiscal year 2025-26 wastewater charges for Service Area 7 are up to $415 per EDU plus $93 per connection for parcels on the adopted roll, while the stormwater rate is $120 per ERU and includes unimproved property. The current tax bill and city payoff record establish the actual balance. With the seller's consent, eligible liens or back taxes can be paid from the proceeds at closing. [6],[7],[8]
The lot has no BPAS award or active hookup
Yes. Parcel Buyers buys vacant land without a BPAS award and with no active water or sewer hookup. A future home still needs the city's residential allocation and permit review. Grassy Key is within wastewater Service Area 7, but service-area location does not prove that a particular vacant parcel has a completed lateral, an active water meter or no remaining assessment. City and utility records answer those questions. Parcel Buyers checks utilities, access and title before offering. [4],[5],[12],[9]
Step by step
How do I sell my land in Grassy Key?
From your first message to money in hand, with nothing left out. Requesting an offer costs nothing and commits you to nothing.
See every detail of the process-
Tell us about your land
Fill out the short form (about 60 seconds) or email us. A land specialist reaches out to confirm the details, usually the same business day.
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Get your cash offer within 24 hours
We review the property and send a written, no-obligation cash offer within 24 hours. It is a real number, not a range. Take it or leave it, with no pressure either way.
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Sign electronically
If you accept, everyone signs the purchase agreement electronically. There is nothing to print or mail at this stage.
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We inspect, the title company verifies
Our team inspects the land and an independent title company runs a title search for liens or taxes owed. If the land does not pass inspection, you are never charged anything.
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Close and get paid
The title company prepares the closing documents for notarization and issues your funds by standard check, overnight check, or wire transfer. A typical sale closes in 10 days.
Questions
Selling land in Grassy Key: common questions
Who issues building permits for a Grassy Key lot?
The City of Marathon issues them. The city says Grassy Key is one of the islands inside its municipal limits, and its Building Department handles permit intake and inspections. Unincorporated Monroe County is not the building-permit authority for these city parcels.
Is public sewer available on Grassy Key?
Yes. Marathon places Grassy Key in wastewater Service Area 7, from Fat Deer Key East through Grassy Key. When an existing septic system is replaced by a city connection, the owner must obtain health approval to convert or abandon it within 180 days after the city's final inspection.
Does a vacant lot have to use a well and septic system?
Usually no. FKAA supplies drinking water in the Keys, and Grassy Key is in Marathon sewer Service Area 7. Monroe County health officials say central sewer is almost universally available, connections are required where it is available, and remaining septic systems must use performance-based treatment. A vacant parcel's actual meter and lateral status still require record checks.
What city assessments can an empty Grassy Key lot receive?
Stormwater is the clearest vacant-property charge. Marathon says the program includes vacant land, and the fiscal year 2025-26 rate is $120 per ERU. A parcel still on the Service Area 7 wastewater roll can also be billed up to $415 per EDU plus $93 per connection. The tax bill shows which lines actually apply.
Can I sell a lot that does not have a BPAS allocation?
Yes. A BPAS allocation is needed for a new residential structure, not to transfer ownership of vacant land. The current city schedule provides 12 total allocations in even years and 15 in odd years, so buyers distinguish a lot with an award from one that still has to compete. Confirm that status through the City before marketing the parcel as ready for a house.
What does a VE flood zone change on a vacant parcel?
A VE zone changes the design and site plan. Marathon code bars structural fill in this coastal high-hazard zone and requires a V-zone certification sealed by a registered design professional. The city identifies all of Marathon as coastal floodplain, so the parcel's exact flood map and base flood elevation are core building checks.
Owner resources
Guides for your situation
- How to Sell Land in a Flood Zone
Flood-zone land can be sellable and sometimes buildable. A FEMA flood zone describes mapped risk; it is not a building permit. The buyer must verify the current effective Flood Insurance Rate Map and any map changes, then ask the local floodplain administrator what elevation, floodway, coastal, permit, and design rules apply.[1][2][4] Vacant land itself is not covered by an NFIP policy; flood insurance covers qualifying buildings and contents, not land value.[5][6]
- How to Sell Land During a Divorce
Florida land can be sold during a divorce when the people with authority to convey title sign and the sale follows every applicable agreement and court order. Divorce law may treat land as marital even when only one spouse appears on the deed.[1][2] If ownership, signing authority, or the division of proceeds is unsettled, have a Florida attorney and the closing title company resolve those issues before closing.
- Can You Sell Land With a Lien?
Yes. Land with a lien can often be sold, but signing a deed does not by itself erase a valid claim. The lien may need to be paid, released, discharged, or otherwise resolved under the law that applies. With the seller's consent, an approved payoff can come from sale proceeds at closing. If the balance or lien is wrong, dispute it before closing and require proof of the cure.
More places in Monroe County
Your written offer
Get your cash offer
Four short steps, about 60 seconds. We review your property and send a written, no-obligation cash offer within 24 hours. You can take it or leave it.
What happens after you send this
- A land specialist reaches out, usually the same business day, to confirm the details.
- You get a written cash offer within 24 hours: a real number, not a range.
- You decide. Requesting an offer costs nothing and commits you to nothing.
You will never be asked to pay us anything. No deposit, no processing fee, no closing-cost advance.
Nearby areas we buy
- Marathon
550 vacant lots · 2025 median lot sale $400,000
- Long Key
80 vacant lots
- Monroe County
5,994 vacant lots countywide
How we made this page
Parcel Buyers is a land-buying company based in Florida. We buy vacant land directly from owners and publish these local pages so owners can see what land in their area is doing before they sell, to us or anyone else. We count the tax-roll figures ourselves from state data, take local rules and fees from the official sources listed below, and use AI tools to help research and draft the text. Every number links to its source, and we update the page when the data changes.
Method and sources
Tax-roll figures cover parcels whose property address city is Grassy Key. Source [1] is our own count of the Florida Department of Revenue's 2026 preliminary property tax roll: "vacant residential" means land-use code 000; lot sizes use the land square footage on the roll; values are the county property appraiser's just (market) value as of January 1, 2026; sale prices count only arm's-length sales of a single lot that was vacant when it sold and was still vacant on January 1, 2026 (bulk and multi-parcel deeds removed). Page updated October 5, 2026. The reviewed 2026 recorded-sale window runs from January through June 2026; unreviewed recent sales are excluded. County-level figures are used on this place page.
- [1] Florida Department of Revenue (data); Parcel Buyers (analysis), Parcel Buyers analysis of the 2026 preliminary Name-Address-Legal (NAL) property tax roll (accessed 2026-10-03)
- [2] City of Marathon, About Marathon (accessed 2026-10-05)
- [3] City of Marathon, Building (accessed 2026-10-05)
- [4] City of Marathon, Building Permit Allocation System (BPAS) (accessed 2026-10-05)
- [5] City of Marathon, Wastewater Frequently Asked Questions (accessed 2026-10-05)
- [6] City of Marathon, Resolution 2025-77, fiscal year 2025-26 wastewater special assessments (accessed 2026-10-05)
- [7] City of Marathon, Stormwater assessment (accessed 2026-10-05)
- [8] City of Marathon, Resolution 2025-78, fiscal year 2025-26 stormwater special assessment (accessed 2026-10-05)
- [9] City of Marathon, FEMA Floodplain Management (accessed 2026-10-05)
- [10] City of Marathon, Ordinance 2018-05, floodplain management (accessed 2026-10-05)
- [11] Florida Keys Aqueduct Authority, Drinking Water (accessed 2026-10-05)
- [12] Florida Keys Aqueduct Authority, Summary of Water Rates, Fees and Charges Effective October 1, 2026 (accessed 2026-10-08)
- [13] Florida Department of Health in Monroe County, Septic Tanks (accessed 2026-10-05)
- [14] Florida Department of Environmental Protection, Curry Hammock State Park Unit Management Plan (accessed 2026-10-05)