Mar Azul has anchored the southern tip of Key Biscayne since 1974, offering direct beach access, an oceanfront pool and sundeck, a fitness center with sauna, a BBQ and picnic area, a gated community entrance with 24-hour security, on-site concierge, covered parking, and a communal social room. The building's name — Spanish for 'blue ocean' — reflects its fundamental orientation: 126 residences, the overwhelming majority three-bedrooms, arranged across eleven floors with the Atlantic Ocean in full view and the natural park landscape of Bill Baggs immediately at the building's doorstep. The community maintains a long-term lease policy consistent with Key Biscayne's predominantly owner-occupied character. At 600 Grapetree Drive, Mar Azul occupies the quietest and most park-flanked end of Key Biscayne, the barrier-island community connected to the mainland by the Rickenbacker Causeway. The entrance to Bill Baggs Cape Florida State Park — 1,800 acres of coastal hammock and pristine Atlantic beach culminating in the historic Cape Florida Lighthouse — begins steps from the building's lobby. Crandon Park, with its championship tennis facilities, municipal golf course, and a mile and a half of protected Biscayne Bay shoreline, lies two miles north. Key Biscayne Shopping Center, local dining, and the Ritz-Carlton Key Biscayne are within the island's compact commercial zone. Brickell, Coconut Grove, and Downtown Miami are accessible via the Rickenbacker Causeway in roughly fifteen minutes. Completed in 1974, Mar Azul rises eleven stories and contains roughly 126 residences in two-, three-, and four-bedroom configurations ranging from approximately 1,670 to 3,711 interior square feet. The building is a concrete structure reflective of the large-footprint tropical modernism prevalent in Key Biscayne's 1970s development era, with generous unit proportions — three-bedroom residences make up the majority of the inventory — and balconies positioned to capture Atlantic and bay views across the surrounding low-rise landscape. Many residences have been individually updated by owners over the decades with contemporary kitchen and bath renovations. The developer and architect of record are not identified in available public documentation. Mar Azul occupies a niche specific to Key Biscayne: a large-format, beach-access residence at the island's southern edge, adjacent to a state park, with unit sizes and a three-bedroom-dominant mix that favor families and buyers seeking genuine square footage rather than pied-à-terre floor plans. The building sits in a municipality known for exceptional public schools, low traffic, and a resort-like quality of life insulated from Miami's urban density. For buyers prioritizing direct ocean access, proximity to world-class public parkland, and the privacy of an island address within fifteen minutes of Brickell, Mar Azul remains one of Key Biscayne's most substantive mid-rise ownership options.