Sometimes a friend becomes a foe. In a statement to The Real Deal last month, retail magnate Joe Sitt said he’d “only had good experiences” with Maverick Real Estate Partners, a prolific debt buyer whose funds Sitt’s Thor Equities had invested in and who he praised as “honest and upstanding.” That may have changed this week. Maverick is seeking to foreclose on a retail building owned by Thor Equities at 446 West 14th Street in