But, you should have cleaned this up earlier this year so you'd be ready.As a sidebar, I would highly encourage anyone planning to do a construction (such as a garage conversion for ADU) to switch to a month-to-month lease with existing tenants leading up to construction. 

I am looking to self manage this property, and outsource cleaning, maintenance, and any other unexpected issues. 

Original owner passed away and family was cleaning it out. 

Deep clean the apartment and then invite the lead inspector in to test it.

It will require a good cleaning, for sure, andd yes there's a chance you may have to paint. 

We added a new bathroom, most everything else was already updated and just needed a deep clean.

It's the general spending on innovation and research such as clean energy and biomedical engineering etc.

More work to do on their part and sometimes your part to help clean up the messy issues.

And from what i've gathered through reading the text messages and emails the tenant had sent to my parents, the tenant really did just install the AC without notifying us. and true, I don't know the extent of their business relationship, but it looks very professional and healthy to me. 

Work with the city attorney/building department, they will be happy to work with you assuming you are going to clean it up and make it tax cash flowing for them again.