Sunny Isles Beach has the longest look-back among the Miami-Dade cities here: improvements are added up over ten years, counting from the first permit after 15 July 1999, when testing the 50% substantial-improvement line. No extra freeboard number appears, so the Florida Building Code floor applies. A decade-long window catches piecemeal upgrades that shorter look-backs would miss.
Source: Sunny Isles Beach Code of Ordinances Ch. 161 Flood Damage Prevention, Sec. 161-10; FEMA Community Status Book, Florida (www.fema.gov/cis/FL.html, report 10/03/2026); 2023 Florida Building Code, Residential R322.2.1, R322.3.2; 44 CFR 59.1; FEMA Flood Map Service Center · Verified 2026-10
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