D&M Auto Leasing is moving its headquarters to downtown Fort Worth into an office building purchased from accounting firm Whitley Penn. Grand Prairie-based D&M's owner and partner, Anthracite Realty Partners LLC, bought the four-story office building at 1400 W. Seventh Street that formerly housed Whitley Penn. The accounting firm, meanwhile, is relocating its headquarters to Frost Tower in Fort Worth, where its recent 45,900-square-foot lease took the city's newest high-rise to 70 percent...