At last count, the founder of Quicken Loans owns more than 40 downtown office buildings, has invested more than $1.3 billion in Detroit, totaling more than 8 million square feet of space. The man, some have argued, has single-handedly injected life and energy into downtown’s streets. And, in part, that’s due to his fortune. At an estimated worth of $3.5 billion, Gilbert was ranked by Forbes as the 425th richest billionaire in the world. Not bad! Within a couple of years, a Gilbert-driven project, the M-1 Rail line, will be operating and connecting some of the city’s most thriving neighborhoods.