- A duplex apartment with a beautiful sea view for sale in Basisikli, Kocaeli Province. The apartment is a duplex (two floors) with an area of 160 square meters and is located on the upper floor. The apartment includes 3 bedrooms, 2 bathrooms, a salon, as well as 4 balconies. The apartment overlooks the famous Marmara Sea. The building has a protection system and a swimming pool.