In August 2026, a Coldwell Banker Schmitt listing went up for a parcel on Overseas Highway in Marathon. Zero bedrooms. Zero bathrooms. The listing disclosed plainly that no real estate would change hands. The asking price was $110,000, and on top of that, the buyer would owe the City of Marathon a mandatory $40,000 transfer fee before the deal could close. No dirt included.

What was actually for sale was a City of Marathon Market Rate Transferable Building Right, a document that lets someone build a house somewhere else. That's the whole product. And once you understand why that piece of paper costs more than some finished condos in the Middle Keys, you start to see Marathon's land market differently. The square footage on a vacant lot listing tells you almost nothing about what you're paying for. The building right attached to it, or missing from it, tells you everything.

Marathon Runs Its Own System, and It Doesn't Work Like the County's

Unincorporated Monroe County controls new construction through the Rate of Growth Ordinance, known as ROGO. Marathon, along with Key West and Islamorada, opted out of the county system years ago and runs its own version called BPAS, the Building Permit Allocation System. Both work on the same basic logic: a point-scored competition for a limited number of permits, tied to a state requirement that the entire Keys population be able to evacuate ahead of a hurricane within a set window.

But Marathon's version skips a step the county uses. The county sorts lots into environmental tiers that affect scoring. Marathon doesn't have tiers. That means a buyer who's done their homework on how county ROGO scoring works can't just transplant that knowledge onto a Marathon lot. The rules, the point criteria, and the allocation pool are separate animals, even though they're solving the same evacuation math.

What the Fee History Actually Shows

The Overseas Highway listing isn't an isolated data point. A Marathon TBR sold in January 2019 for $40,000, with the buyer also covering the city's transfer fee, which was $20,000 at the time, plus roughly $6,900 in closing costs. All in, that buyer paid close to $67,000 for a right with no land attached.

In July 2022, Marathon doubled its transfer fee from $20,000 to $40,000. By August 2026, a TBR alone was listed at $110,000, with that same $40,000 fee still attached.

That's more than double the all-in cost of the exact same product in roughly seven years, and the fee alone accounts for part of it. The rest is scarcity. As Marathon's allocation pool has thinned out, the open market price of the underlying right has climbed with it, independent of whatever happens to the price of actual land.

Three Ways a Marathon Lot Gets a Building Right

When you're comparing vacant parcels in Marathon, every one of them falls into one of three categories, and the category matters more than the price per square foot.

The first is exemption. If a lot had a legal structure on it before, even one long since torn down, the right to rebuild never expires and never has to compete for a permit. The owner just has to document that the structure existed, typically through a Letter of Determination from the city. No scoring, no waiting, no deadline to start construction.

The second is an active allocation already sitting on the property, awarded through the BPAS point system and not yet used.

The third is raw, undeveloped land with no documented history and no allocation attached. That lot cannot be built on until someone either wins a spot through the competitive point system or buys a Transferable Building Right and pays the city to move it onto that parcel. A TBR has to come from a sending site and land on a receiving site of a comparable type, so a right that started under one zoning designation doesn't automatically clear onto a lot zoned differently.

This is why a suspiciously cheap vacant lot in Marathon deserves a second look before it looks like a bargain. Cheap sometimes means unbuildable, at least not without adding six figures in TBR costs on top of the purchase price.

The State Just Loosened the Valve, But Not for a While

The regulatory backdrop shifted in 2025. Governor Ron DeSantis signed Senate Bill 180 into law on June 26, authorizing up to 900 new building rights across the entire Keys island chain, phased in over a minimum of ten years. The tradeoff was a small change to the safety math behind the whole system: the mandated hurricane evacuation clearance time moved from 24 hours to 24.5 hours, which is what created room for the new units in the first place.

The first tranche, 300 rights spread across every Keys jurisdiction, became available starting January 1, 2026. Marathon's share of the full 900-unit pool over the coming decade is 135 units. Unincorporated Monroe County gets the largest cut at 657, with Islamorada receiving 72 and Key West 36. After the initial release, another 150 units get distributed every two years until the full 900 is out by 2035.

That's a long runway. And in the meantime, Marathon hasn't been generous with what it already has. Marathon Planning Director Brian Shea told Keys Weekly in October 2025 that the city had slowed its awards to just five building rights every six months, with two of those set aside as unrestricted market-rate rights and two reserved for owner-occupants. That pace, combined with a ten-year phase-in on the new state allocations, is why a TBR alone still commanded $110,000 in August 2026 even after the SB 180 news had been public for over a year.

What This Means If You're Comparing Lots Right Now

If you're looking at vacant land in Marathon, the building right question needs to come before the price-per-acre question. A few things worth confirming before you get attached to a listing:

• Ask whether the lot is BPAS-exempt because of a documented prior structure, and request the Letter of Determination if one exists
• If there's no prior structure, find out whether the lot already carries an active allocation or whether you'd be entering the competitive point system from scratch
• If a TBR is being sold separately from land, confirm the sending site is a compatible type for the receiving lot you have in mind
• Budget for the $40,000 city transfer fee as a separate line item from whatever the right itself costs, on top of standard closing costs
• Don't count on the SB 180 pipeline to loosen the Marathon market soon. Only 135 rights are earmarked for the city over the next decade, released in stages through 2035, not all at once

Common Questions About Building Rights in Marathon

Does a vacant lot without any building right have zero value? Not necessarily. Some buyers purchase raw, allocation-less land specifically to bank it while planning a TBR purchase later, or with the intention of entering the BPAS competition. The value is just speculative rather than immediate.

Will the new state allocations bring TBR prices down? Possibly, eventually. But with only 135 units earmarked for Marathon spread over a ten-year window, and the city already awarding rights at a slow pace, there's no evidence yet that supply is loosening in any timeframe shorter than years.

Can I use a right that started on a different type of lot? Generally no. Sending and receiving sites have to match in type and zoning designation, so a right's origin matters as much as its destination.

If you're comparing land in Marathon and want someone to walk through what a specific lot's paperwork actually says before you make an offer, that's exactly the kind of groundwork Jessica Borraccino handles for buyers every week. Let's connect and schedule your free consultation.