I have a 55 gallon aquarium on the second floor of my apt, and I was scared to even put it in here. It all depends on who built the building, and how much support they gave it. Many times, apartments are put up so fast they hardly have enough support to hold a full bath, much less a giant fish tank. Keep in mind that water weighs just under 8 pounds per gallon, so just a 200 gallon tank would wieigh 1600 pounds just in water weight. Not to mention the glass and stand and gravel etc. I would advise you to do a lot of research and be very careful, that is a major liability for a lease/contract.