Mmm...I understand both sides of this issue as I am also a home owner and I would have my own concerns if renting my property to someone who wanted to set up a grow inside my property. The first issue I would be concerned with, regardless of owner or renter , but mostly as an owner, I would be concerned with how much he was trying to draw off of the available electrical circuits that were available in that space that they were interested in growing. What kind of system are they looking at? Even a small portable 1200 BTU portable dual port AC, for a closed grow set up, draws a current of 1200-1300 watts max on a 15 amp breaker of what is usually allowed in a normal bedroom at about a maximum of 1800 watts available on a regular basis. Then add 1000 watts, or the actual number of watts that your lights require, and then what you need for fans and any other accessories like humidifiers, dehumidifiers, blah, blah, blah, and as a homeowner , realizing that a single room is usually used to grow, then it doesn't take long to be concerned as to how a tenant may be trying to over grow on what is actually available in electrical supply, and I for one do not want to burn my house down trying to over draw on what is available on 1 circuit, which is usually how a room or zone is determined in construction. In determining my own needs as a home owner, I had to add extra electrical power by adding breakers to my electrical panel and extra outlets in my grow room to accommodate my dedicated electrical needs at an acceptable level (not including costs for extra electrical from month to month on your electrical bill) to make sure my electrical layout was able to accommodate my needs safely, not often revealed by any tenant trying to stay incognito. So yes, there are concerns as a homeowner, especially concerning electrical power available for what is required and how much is actually available and what a tenant might want to do...and then there is insurance...
...and that is the ultimate concern to protecting what you own, so conditions would apply....sorry
...unless you rented my space