ID# 116902. Luxury oceanfront apartment for sale in Las Catalinas, Guanacaste, Los Altos Flats condominium, 108 sqm, 2 bedrooms, 2 baths, US$625.000. The Avenida de Los Altos Flats is a collection quaint cascading 2 bedroom ocean view apartments with private pools, parking, and extra storage space. These unique set of flats offer ample outdoor living as well as back right up to the beautiful Costa Rican Tropical Dry Forest.