Dan Gilbert confirmed that he plans to build an addition to the One Campus Martius building downtown where his Quicken Loans Inc. makes its headquarters.

In an interview Wednesday afternoon with Crain's, Gilbert did not elaborate on size or timeline for construction, but when asked about the potential for an addition to the 1 million-square-foot building he and Detroit-based Meridian Health purchased for $142 million in 2014, he said, "I'd say you're on the right path on that." Crain's reported in March that recent behind-the-scenes discussions had taken place about adding around 250,000 square feet to the building on its north side, according to one source. Two other sources confirmed discussions but did not know the size of the planned addition.