Neptune on Longboat Key is a small residential condo community of roughly ten to twelve units at 540 Neptune Avenue, just off the Gulf of Mexico Drive corridor on the mid-southern, Sarasota County section of Longboat Key in ZIP 34228 (Premier Sothebys International Realty community guide, 2026). The island is split between two counties at about the 4000 block of Gulf of Mexico Drive, and Neptune sits south of that line, on the Sarasota County side (Town of Longboat Key county references, 2026).
The community was built in the early 1970s and is intentionally minimal. There is no pool and no fitness center, and several listings describe a private fenced patio and garden at the unit level, a ground-level outdoor format unusual at this scale (community guide and listing data, 2026). Because the association covers maintenance, grounds, and insurance rather than a resort amenity platform, the HOA has historically been among the lowest of any residential condo on the mid-southern corridor.
The boutique scale is the headline, but the math underneath is what sets value. An early-1970s coastal building carries roof, systems, and structural questions, and Florida now requires milestone inspections and a structural integrity reserve study for many older condos, so the reserve position and any pending special assessment are concentrated per-unit research items. The flood zone and the windstorm insurance quote are equally decisive on a barrier island.
The pitch is a quiet, low-maintenance Longboat Key address near the Gulf at a carrying cost closer to the islands lower end. The work is verifying the association budget, the milestone and reserve documents, the rental rules, the flood zone, and the insurance number for the specific unit before you let the address sell you.
