rotate plants of 90 degrees and possible?

[gianni3d]

Hello guys I have to continue a project not started by me where the plants of a rectangular edifio sink long. the problem and that it was started with the short side vertically ie standing to understand us and I am not very easy to work fast. there is a system to be able to rotate. If I try with the only wheel it gives me error naturally because it has the grills et etc that can not carry them back.
If there is a system I will be much easier. .
Thank you.

 

[gianni3d]

I add here without spam further a good question... in the same file I don't know who coglion.... has erased existing plants and demolition and I found myself with 3 plants that exist, demolition, new project equal.. .
looking in the servers I caught an old file only with existing and demolition.
how I can insert them in this new file. if I make a copy and paste it reads me a new plant and if but it pulls close to what I already have... I just need to add them and replace them... I know that it is not autocad but work on the parametric etc. but how can I fix it without redesigning everything?
Thanks