Two apartments in the same Key Biscayne building, with the same floor area and the same number of bedrooms, rarely carry the same value. The useful comparison is not between listings, it is between the public records for each unit.
In a resale the seller asks what they like; what matters is what was recorded in prior sales of comparable units. That is where what the listing leaves out shows up: the floor area on the parcel record versus the one in the advertisement, the year built, the closed or open renovation permits on that specific unit, the dues it carries, the liens on title and the approved special assessments. Comparing without those records is comparing two sales pitches, not two properties.
Key Biscayne moves through a different channel because the village keeps its own permit counter and because everything that reaches the island crosses a single bridge. For a buyer abroad that is not scenery, it is logistics. The contractor quoting a renovation prices in travel and the delivery window in which material can be unloaded; the appraiser and the inspector your lender sends depend on that same bridge; and scheduled work can stop because of a closure nobody told the buyer about. On top of that, the county does not grant the approval: height, setback, landscaping and dune protection rules are set by the village, and when the parcel touches the shore a state authority enters as well, so a wall, a dock or a pool may require more than one file. Ask your insurance broker how the carrier reads the exposure of that specific parcel and what it requires before issuing; ask your closing attorney whether dune restrictions or easements are recorded on title; ask the village which work is approved at the counter and which goes before a board. It also pays to learn who manages the building or the association, because on a small island the manager is the person who actually answers.
What is specific to Key Biscayne
A barrier island with its own village government, reached only by the Rickenbacker Causeway, with large parks at both ends. Oceanfront towers, low-rise buildings and a core of single-family homes inland. A single tolled road in; there is no rail and no alternative if the causeway closes.
- what the single road implies: evacuation, rush hour and closures for works or events
- the parcel's coastal exposure and what that means for insurance
- the village's own rules, which are not the county's
What to verify, step by step
- Look up each unit by address on the county Property Appraiser's record and note floor area, year built and the recorded sales history.
- Compare the sales history of units in the same building and the same facade line, not of similar buildings elsewhere in the area.
- Search the Clerk's records for liens, encumbrances or litigation recorded against each unit you are comparing.
- For each one, request the current association dues with the minutes that set them and ask whether a special assessment has been approved.
- Review the county building permits on each unit: a renovation without a closed permit transfers with the property.
- Ask a Florida-licensed broker for the written comparative analysis and for the list of units used to produce it.
Mistakes that cost money
- Comparing asking prices instead of recorded prices: the first is an expectation, the second is a recorded fact.
- Accepting the listing's floor area without checking it against the parcel record.
- Comparing two units without comparing what each one pays in dues and in special assessments.
Frequently asked questions
- Where do you see what was actually paid for an unit?
- In the sales history on the parcel record and in the deed recorded with the Clerk. Both are public and do not depend on the seller.
- Why do two identical units on the same floor differ in value?
- Because orientation, view, interior condition, renovation permits and the dues they carry all differ. Each of those is checked separately.
- Is it useful to compare against neighbouring buildings?
- As context, yes; as a measure, no. The strong comparison is within the same building, because those units share dues, reserves and age.
Where to check it
- Miami-Dade County Property Appraiser — record card, area, year built and parcel history
- Miami-Dade Clerk of the Courts — deeds, liens, encumbrances and litigation on the property
- Miami-Dade Permitting and Inspection Center — open or closed building permits on an address
- Florida DBPR — whether a broker, appraiser or contractor holds a current licence
- Village of Key Biscayne — the rules of the municipality Key Biscayne belongs to
Official bodies. Specific figures are requested there, not copied from a listing.
Updated 2026-11-06
More about Key Biscayne
- Closing Costs for Property Buyers in Key Biscayne: What to Include in a Budget
- Property Taxes in Key Biscayne: Questions International Buyers Should Ask
- Can Colombian Buyers Get a Mortgage for Property in Key Biscayne?
- Can Brazilian Buyers Finance a Property Purchase in Key Biscayne?
- Buying Property in Key Biscayne from Colombia: Documents and Steps
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