Oh my god dude, same thing happened to me just a few weeks ago. So my brake resevoir off base, noticed my car was even lower (had trouble getting into my garage) then someone pointed out the crack..on both sides
Good News
It can be fixed...this thing used to happen alot to Older Hondas..but can happen if u are lowered and hit a HUGE PotHole a few times....also, the mechanic I found to fix it says Honda "spot" welds the tower bar area...so another reason why it weakened
Anyways...
I found a reputable race car mechanic who took out my suspension, welded it, re-inforced it and put my suspension back for $750..hehe, Honda was quoting me $2500 when they saw it
And its recomended to get a strut bar...a good one...so u are looking at another $150 for a good one
hope this helped, feel free to ask anymore questions