Hathaway Dinwiddie Construction Company is a general contractor and construction management company based in San Francisco, California. The company was founded in 1911 and has completed many notable projects in the San Francisco Bay Area, including the Salesforce Tower, the San Francisco Museum of Modern Art, and the Moscone Center expansion. Hathaway Dinwiddie Construction Company has also completed projects in other parts of California, as well as in Hawaii, Nevada, and Washington. The company has a reputation for quality work and has won numerous awards for its projects.