I don't personally see the harm in getting 3 bids.

However, I am not too familiar with ozone generators and the harm they can cause.  

Can’t see the harm.....if it goes worst case and the tenant wants to/can buy the property, and you end up in court, the tenant would prevail anyway.

[Not related to the substance of the post, but in case anyone wondered]Moore's Law: Every 1-2 years, computer processing power will double.Murphy's Law: Anything that can go wrong, will go wrong.

If the numbers work, then "no harm done".

The last thing I look to do is harm people. 

Given that, I don't think there was any harm at the front end when they were looking in telling them that you put in a lot of hard work cleaning the place up and leaving it at that.

Hostile policies towards development just push people to other cities to do their building.Here are some links about the harm rent control does:Beacon Economics research study on rent control - https://caanet.org/app/uploads/2016/02/Jan2016_Ren...Perspective on helping low income afford housing - http://www.lao.ca.gov/Publications/Report/3345Legislative Analysis suggesting housing construction rather than rent control - https://caanet.org/legislative-analysts-office-enc...

Absolutely no harm in asking.

Does "fighting fires" constitute using a $20 fire extinguisher to extinguish a small grease fire that would have burned down the unit and possibly other units, potentially harming all tenants?