HELOC on Key Biscayne: Unlock Island Equity, Condo or House

Short answer

Yes, you may qualify. QMS offers HELOC programs with lines up to $750,000 on primary and second homes, including condos on many programs, subject to credit approval, property and program guidelines. At the Q2 2026 island condo median of $1,525,000, a unit with a $500,000 first mortgage and an illustrative 75% CLTV cap leaves room for a line of up to about $643,750 (example only). The village says the whole island is in the Special Flood Hazard Area, so flood coverage must be in place.

Key Biscayne equity in 2026

The island is mostly condos. In Q2 2026 the Village of Key Biscayne recorded 53 condo and townhouse sales at a median of $1,525,000, up 27.1% from a year earlier, and 10 house sales at a median of $3,000,000, per Florida Realtors data published by MIAMI REALTORS (as of October 2026). Condos were about 84% of sales.

If your unit tracked that 27.1% rise, your equity grew with it. Countywide, the MIAMI REALTORS South Florida Housing Wealth Report estimates that a Miami-Dade condo bought 15 years ago carries a median of $352,500 in equity, about 83% of its value (Q2 2026, model-based).

A HELOC turns part of that equity into a credit line without touching your first mortgage. Buying? See our Key Biscayne mortgage broker page.

What QMS HELOC programs offer island owners

Many Key Biscayne owners spend part of the year elsewhere. QMS offers HELOC programs for second homes as well as primary homes and investment properties. Depending on the program, as of November 2026:

• Lines up to $750,000.
• Up to 90% CLTV on some primary-home programs. Condos, second homes and rentals usually have lower caps.
• Condos on many programs, once the building passes review.
• First- or second-lien lines.
• Automated valuation on many smaller lines; at island prices, most lines will need a full appraisal.

All subject to credit approval, property and program guidelines.

Quick example (example only)

Example only. Illustrative numbers, not an offer. Rates vary daily; call for today's pricing.

Condo at the island median:

• Value $1,525,000; first mortgage $500,000 (illustrative); CLTV cap 75% (illustrative; condo caps vary by program).
• Total debt allowed: 75% of $1,525,000 = $1,143,750.
• Line available: $1,143,750 minus $500,000 = up to about $643,750.
• Florida taxes: on a $643,750 line, intangible tax is about $1,290 at closing; doc stamps run about $350 for every $100,000 you actually draw (charged on the first draw and on later advances). Your title agent confirms the exact amount.

House at the island median:

• Value $3,000,000; first mortgage $1,200,000 (illustrative); CLTV cap 75% (illustrative).
• The math allows $2,250,000 minus $1,200,000 = $1,050,000, but the program maximum caps the line at up to $750,000, with about $1,500 in intangible tax at closing, plus doc stamps on what you draw.

See what is LTV.

Older oceanfront towers: milestone, SIRS and assessments

Many island towers are decades old. Florida Statute 553.899 requires a milestone inspection for condo buildings of three or more habitable stories by December 31 of the year they turn 30 (or 25, if the local building official requires it because of salt water), then every 10 years. Associations also need a SIRS reserve study.

The usual friction here: large special assessments for concrete, balcony and fire-safety work, and reserves still catching up. A line lets you pay an assessment as the association bills it, without draining savings.

The program reviews the building too, and open assessments or thin reserves can change which programs accept the unit. We request the condo questionnaire, budget and latest inspection report before you pay for an appraisal. Details in our HELOC on a Florida condo guide.

Flood insurance: the whole village is in the high-risk zone

The Village's hurricane and flood guide says the entire village is in the Special Flood Hazard Area. Under 12 CFR 339.3, a regulated lender may not make or increase a loan on a building there without flood insurance, and that includes a HELOC.

• Condos: the association's master flood policy covers the building, and the program will review it.
• Houses: you carry your own policy, and an elevation certificate drives its price.
• Discount: the village takes part in the NFIP Community Rating System to keep a 10% premium discount for residents (as of October 2026).

Taxes and Florida line costs on the island

The 2025 adopted total millage for the Village of Key Biscayne is 15.5108 mills, about 1.55% of taxable value (Miami-Dade Property Appraiser, as of October 2026): roughly $23,700 a year on a $1,525,000 condo before the homestead exemption. A HELOC does not change it, but programs count it in your DTI.

Amendment 3 (approved November 3, 2026, unofficial until certified) raises the non-school homestead exemption from about $51,411 for 2026 to $150,000 in 2027 and $250,000 in 2028. For non-homestead units, the yearly assessment cap drops from 10% to 5% from January 1, 2027. First bills affected: November 2027.

If the home is your homestead and you are married, Florida's Constitution requires your spouse to join in the mortgage. Homestead protection does not stop foreclosure on a mortgage you signed. HELOC interest may be deductible only if the money buys, builds or substantially improves the home that secures it; ask your tax professional (IRS Publication 936).

Speed and next steps

On a second home, some programs fund in as few as 5 days after approval, subject to credit approval, property and program guidelines. On your primary home, federal Regulation Z gives you 3 business days after signing to cancel, and funds are released after that. Condo questionnaires, title and county e-recording can add days. See fast HELOC in Florida.

A cash-out refinance replaces your whole first mortgage; compare in HELOC vs cash-out refinance.

QMS Lending is an independent mortgage broker in Miami, FL, founded in 2018 (NMLS #1781090) and led by Michael Fernandez (NMLS #1491775). We compare 100+ lenders, hold 4.9 stars on 200+ Google reviews and work in English and Spanish. See our HELOC programs and the Florida HELOC guide.

See how much you can unlock. Call 305-425-1990 or contact us. Rates vary daily; call for today's pricing. Subject to credit approval. Equal Housing Opportunity.