how big it can handle

[Todd]

Agreed, Once - back in the day - when I was living in RES, I heard a story about the top floor (of a concrete 11 story building) turning their large bathroom into a large large hot tub. After that a structural engineer did some calculations and found that they were still a few tons below a structuaral failure. Good old res hey...

[TheReefGeek]

I wouldn't put them side by side if you can help it, and put them against walls if possible, but the weight should be fine.

I would be checking with the high rise about it thought.