Key Biscayne is a village in Miami-Dade County, Florida, occupying the barrier island of the same name in Biscayne Bay, about ten miles southeast of downtown Miami. Part of the Miami metropolitan area, it is a compact, affluent residential community bounded by the Atlantic Ocean on one side and Biscayne Bay on the other. The island's modern history began in earnest with the completion of the Rickenbacker Causeway in 1947, which linked Key Biscayne to the mainland and opened it to residential development. Before that, the island was a sparsely settled outpost, though it already held a significant landmark: the Cape Florida Light, a lighthouse built in 1825 and rebuilt in 1846 that stands today as the oldest structure in Greater Miami. Two large parks frame the village. Crandon Park occupies the northern end with its beach, golf course, tennis center, nature center, and marina, while Bill Baggs Cape Florida State Park covers roughly the southern third of the island, offering beachfront, fishing, bike trails, and the historic lighthouse. Between them, the residential core stretches along Crandon Boulevard. Key Biscayne's residents include families, professionals, and executives, many of whom commute across the causeway to downtown Miami, Brickell, and Coral Gables. The village center near the causeway landing clusters shops, the K-8 school, and civic buildings, while the marina and shoreline parks anchor weekend activity. The island's flat, tree-lined streets are popular for walking and cycling, and with both ends of the island given over to parkland, nearly every home sits within a short walk or ride of the beach or the bay. Housing ranges from waterfront condominiums to single-family and contemporary two-story homes, reflecting decades of development within a strictly limited footprint.