Deniz İstanbul by Keleşoğlu is presented as the first and only seaside town of Istanbul: a 1,500-decare (1,500,000 m²) seafront development in Yakuplu with a 1.5 km coastline on the Marmara Sea. The town combines sea-view residential neighbourhoods with a school (nursery, primary and high school), avenue shops, a 250-bed hospital, a 5-star hotel, a shopping mall with 180 stores, a marina, a beach and seaside cafés and restaurants. The midclubs Sports & Wellness Club offers fitness, indoor and outdoor pools, squash, tennis, a Turkish bath, sauna, spa, walking and cycling tracks, horse riding and an open-air cinema.

The project is made up of several phases: Sedef Mansions (55 blocks and 22 villas on 169,000 m², 3+1 and 4+1 flats and villas), Mercan Mansions (78 low-rise blocks on 122,000 m² with two flats per floor, 1+1 to 4+1), Marina Houses (87 villas on 64,500 m², 4+1 twin to 5+1 detached villas of 454–584 m² net), Marina Residence (7 blocks on 30,600 m², flats from 187 m² to 338 m² with up to 70% green space) and Bahar Residence (26 blocks with 574 apartments from 1+1 to 5+1 on 50,082 m²). Every home comes with a two-year Keleşoğlu after-sales service warranty.