Key Biscayne is an upscale island just off the coast of Brickell/Coconut Grove. High-end and exclusive are two words coming to mind when thinking of Key Biscayne. Homes are often waterfront and desired with boaters. The island is also in vogue with families, as it offers a superb public school. Key Biscayne offers a fair share of luxurious condos, albeit that there is just one brand new, ultra-luxury condo on the island.