I had 120g tank with sump on the ground floor in a 7' stand, with no problems.
I did check to see how thick the foor was. When I pulled up the floor I saw tire tracks from a crane-all.
It was one of the polygon biuldings by pine tree and david.
I would look for a ground floor condo with the parkade under you. then get you can get your 300 g reef.
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120 G sps reef, looking to build bigger. 
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