Most newer buildings are designed to hold 250 lbs per square foot, anywhere on the floor. If your wall you wont to put the tank on the outside of your place you should have no problems. Most condos are the same floor plan up and down, so if you put it next to the wall there should be a wall right below your wall.
If you build your own stand line it with rubber to catch any spills. Thats what I did and work pretty good.
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120 G sps reef, looking to build bigger. 
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