Medi Falsafi isn't someone who leaves a lot to chance. And so, when his landlord at the Lafayette Center in downtown D.C. walled off the interior, open-air atrium facing his offices in the building's basement to install a fitness center to accommodate another tenant two years ago, Falsafi came to an important conclusion: In order to control its own destiny, ABC Imaging needed its own building rather than continuing to be a rent space in another landlord's property. No, this isn't the classic anecdotal…