Okay, what are the dates for the apartment in building 225 ?
SELECT T1.booking_start_date ,  T1.booking_start_date FROM Apartment_Bookings AS T1 JOIN Apartments AS T2 ON T1.apt_id   =   T2.apt_id WHERE t2.building_id  =  "225"
dates for the apartment refers to booking_start_date; in building 225 refers to WHERE building_id = '225';