As for the letter we must realize that one thing its not his property second you need to have permission for any modifications on any rental property ,. green house or not
please not trying to be a dick here just saying
growing indoor can cause lots of damage , mold floods you name it
did the person ask if he could just because you rent a house does not allow you to modify a room or do anything possibly illegal just saying
The owner is looking out for his best interests easy for a person to wreck something and walk away and leave owner in a world of hurt
So he is just covering his ass,, Does it make him a ass hole not one fucking bit
if i owned a rental property i would want to know if there is a grow going on wouldnt you ?? if you owned the property ..
And on second note why the hell do you not buy your own home then you can make it into one big fucking greenhouse