Specifically from the Caged AC Unit into the attic (concrete slab so no crawl space).I was thinking of just building a tall vertical box to place this into.  

My PA lease has specific clause on the second matter of your question. 

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If the violations took place prior to purchase, I would at least give them written notice that you are aware of the previous violations and that just one under your watch would result in an eviction.in the meantime, I would shop for new insurance and pass the increase on to the tenant.

Did you expect it to be that lucrative when you made the purchase?

Quote from @Kyle Harris: I'm a new investor and looking to learn as much as I can this year and hopefully make a purchase on a multifamily unit by the end of 2025.

If you are very conservative purchase a fixer upper so you can force equity and hopefully have a low enough payment so that you can LTR the property or even sell for profit should the STR avenue not work. 

I’m new to real estate investing and hope to purchase my first property within the next year.

One of the things we do and recommend to our clients is to purchase a home owners warranty to cover all of the mechanical, electrical and plumbing compenents.

Quote from @Tangie Pate: Has anyone purchased the Lee Arnold System and used his pre-trained virtual assistants?