One of three medical marijuana dispensaries in South Lake Tahoe could be forced to close following a crackdown on California's marijuana trade by federal prosecutors.City of Angels 2 Collective will be required to leave its location at 989 Third St. by mid-July after the owner of the building, De Tarr Properties, received a letter from federal prosecutors in February, according to a staff report by City Attorney Patrick Enright."This letter is formal notice that continued use of the property in violation of federal law may result in forfeiture and criminal or civil penalties," Assistant U.S. Attorney Kevin Khasigian wrote in …