http://sqlfiddle.com/#!9/5ad1fb/4
SELECt u.*, COUNT(ut.id) property_countFROM users_table uLEFT JOIN users_table utON u.id = ut.property_idWHERe u.admin = 1GROUP BY u.id, u.name, u.admin

http://sqlfiddle.com/#!9/5ad1fb/4
SELECt u.*, COUNT(ut.id) property_countFROM users_table uLEFT JOIN users_table utON u.id = ut.property_idWHERe u.admin = 1GROUP BY u.id, u.name, u.admin