Too heavy for 2nd floor??

[ickmagnet]

I currently have a 135 gallon on the second floor of my home. At the time I bought it, it served my purposes as I wasn't very familiar with saltwater. Now, I am realizing that I should possibly upgrade the tank quality and hopefully the size as well. The only question is, how much more weight can my floor handle? I really don't know much about construction but it is obviously wooden and probably pretty standard stuff. The 135 seems to be doing just fine. I was really really hoping to get a 215 gallon (along with a small sump) that caught my eye. Could this work?