475 Allendale Road in Key Biscayne. Photo: Google

Address: 475 Allendale Road in Key Biscayne 

Property type: This is a 3,121-square-foot, two-story home with three bedrooms and four bathrooms constructed in 1951 on a 7,622-square-foot lot.

Price: $2,200,000

Sellers: John and Heather Rafferty

Buyers: Philipp Rusch Back and Elizabeth Costa de Rusch

Past sale: $1,610,000 in May 2013