SunTrust International Center, Commercial skyscraper in Downtown Miami, United States

One Downtown, formerly the SunTrust International Center, is a 125 m (375 ft) office skyscraper at Southeast 1st Street near 3rd Avenue in Downtown Miami. It rises from a six-story parking pedestal to 31 floors and is almost entirely Class A office space. It was built by The Auchter Company and stands one block west of Biscayne Boulevard.

Built by The Auchter Company, the tower opened in 1973 and was long known as the SunTrust International Center, the Miami headquarters of SunTrust Bank. Crocker Partners bought it for $82.4 million in 2011, and in May 2018 PCCP acquired it for $127 million with a $101.8 million mortgage from Invesco. It now carries the name One Downtown.

The building stands as a landmark of Miami's growth as a financial center, housing banks and corporations that shape the city's business landscape. It reflects how the city positioned itself as a major economic hub.

The tower stands on Southeast 1st Street near 3rd Avenue, one block west of Biscayne Boulevard. The closest Metromover stops are Inner Loop and Bayfront Park stations. The building is almost entirely Class A office space, so interior access is for tenants and their guests rather than general sightseeing.

The tower rises from a six-story parking pedestal, and its 31 floors reach 125 m (375 ft). Completed in 1973, it sits behind the taller One Biscayne Tower, so since 50 Biscayne was finished it is partly hidden from Biscayne Bay. The nearest Metromover stations are Inner Loop and Bayfront Park.