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DETROIT — Twitter, the San Francisco-based social media company, is opening an office in Detroit at the M@dison Building. The M@dison Building, located at 1555 Broadway, is owned by Rock Ventures LLC, the umbrella entity for Dan Gilbert's portfolio of companies, investments and real estate. Gilbert is the chairman and founder of Quicken Loans. The building is already home to several tech companies such as Detroit Labs and Doodle Home. Twitter's new office will include a team of employees who help advertising agencies and marketers use Twitter's advertising products, according to a statement. Rock Ventures' management firm, Bedrock Real Estate Services LLC, represented both parties in the deal.