Building facts
- Address
- 20 Island Avenue
- Neighborhood
- Belle Isle
- Year built
- 1962
- Floors
- 15
- Status
- Completed
- Pricing
- Starting at $475,000
Key Takeaways
- 222 residences at 20 Island Avenue, with no commercial folios — the largest of the Belle Isle buildings.
- Price per square foot rose steadily through 2025 — $624, $679, $691 — against a market where most comparable buildings fell.
- Median sale price rose in every year on record, from $560,000 to $725,000.
- This is a compact-format building — 129 one-bedrooms and 22 studios against 70 two-bedrooms, median 897 square feet.
- The 2026 median assessed value is $438,361, making it one of the more accessible ways onto the island.
- Volume thinned sharply — 17 qualified sales in 2023, then 10, 10 and just two so far in 2026.
20 Island Avenue, Miami, Florida | Neighborhood: Belle Isle, Miami Beach
The largest building on Belle Isle
Belle Isle is the smallest and easternmost of the Venetian Islands, sitting in Biscayne Bay between South Beach and the mainland and reached from the Venetian Causeway. It holds a handful of mid-century condominium buildings and almost nothing else, which is why it stays quiet despite being a short walk from Sunset Harbour and Lincoln Road.
Counted against the Miami-Dade County Property Appraiser record on 17 August 2026, Belle Plaza returns 223 folios, of which 222 are residential and none commercial. That makes it the biggest of the island’s buildings, ahead of Costa Brava at 214 and Nine Island Avenue at 267 across the water side.
The mix is compact: 129 one-bedrooms, 70 two-bedrooms, 22 studios and one three-bedroom, with heated area from 592 to 1,964 square feet and a median of 897. With a median assessed value of $438,361, this is where the island’s more accessible inventory sits.
One of the few buildings where values rose
Qualified sales from the county record — arm’s-length only.
| Year | Qualified sales | Median price | Median $/sq ft |
|---|---|---|---|
| 2023 | 17 | $560,000 | $624 |
| 2024 | 10 | $590,000 | $679 |
| 2025 | 10 | $647,500 | $691 |
| 2026 to date | 2 | $725,000 | $627 |
Both columns moved the same way through 2025, which is the cleanest signal you can get from this kind of data. Median price rose $560,000 → $590,000 → $647,500, and per-foot pricing rose $624 → $679 → $691. When size-adjusted and headline figures agree, the underlying market really did move.
Most buildings I have measured this way declined over the same window. Belle Plaza did not — and it is not alone on this island, which suggests the location is doing the work.
The 2026 row is two sales. The $725,000 median is the highest on record and the $627 per foot the lowest since 2023, which simply means the two homes that traded were larger than usual. Two transactions cannot tell you the trend either way.
Who this building suits
This suits a buyer who wants Belle Isle at a realistic price. At a $438,361 median assessed value it is a fraction of Belle Towers up the street, for the same island and the same walk to Sunset Harbour.
It suits a space-driven buyer less well — at a 897 square foot median this is a one-bedroom building, and the single three-bedroom is not inventory you can plan around.
If you are selling here, the three-year record is genuinely on your side: rising on both measures, in a market where most comparable buildings softened. That is a specific and verifiable argument.
Verified 17 August 2026 against the Miami-Dade County Property Appraiser record for 20 Island Avenue — all 223 folios retrieved individually, then filtered to dwelling-sized residential units before any figure here was calculated. Building age and storey count are omitted: published sources conflict and none has been confirmed. Re-check when the next tax roll publishes.
Belle Plaza — Frequently Asked Questions
How many units are in Belle Plaza?
The Miami-Dade County Property Appraiser records 223 folios at 20 Island Avenue, of which 222 are residential. There are no commercial folios. It is the largest condominium building on Belle Isle.
Are values rising at Belle Plaza?
Through 2025, yes, on both measures. Median sale price rose $560,000, $590,000, $647,500 and price per square foot rose $624, $679, $691. When both move together, the underlying market really did move — most comparable buildings fell over the same period.
What size are the residences at Belle Plaza?
Heated area runs from 592 to 1,964 square feet with a median of 897. The mix is 129 one-bedrooms, 70 two-bedrooms, 22 studios and one three-bedroom.
How does Belle Plaza compare to other Belle Isle buildings?
It is the largest and among the most accessible. Its median assessed value of $438,361 compares with $1,381,598 at Belle Towers and $445,196 at Island Terrace, for the same island location.
What do condos at Belle Plaza sell for?
The most recent full year is 2025, with ten qualified sales at a median of $647,500 and $691 per square foot. Only two sales are recorded so far in 2026.
Is Belle Plaza a good investment?
The three-year record is stronger than most buildings measured the same way — rising on both price and per-foot measures through 2025. The caution is liquidity: qualified sales fell from 17 in 2023 to 10, then two so far this year.
Sources and further reading
Interested in selling at Belle Plaza in Miami Beach?
Learn more about selling condo at Belle Plaza with Josh Stein.
Related coverage
Part of Miami Luxury Condos.