We did a lot of the work ourselves but it still cost about 30k since we hired professionals for permit work and replaced appliances.

So, I would treat the deal as if the seller is striving in every way possible to rip me off, and I would verify EVERYTHING; I would go to city and check on all building permits vs what there, rental licensing, zoning, I mean literally everything I would leave nothing to chance what so ever. 

Due to permit issues if you can believe that it’s been a year.

I’m in Philadelphia, PA and was wondering if I needed a permit for a washing machine/dryer hookup in one of my apartments?

Fannie Mae and Freddie Mac both are still permitting 75% of the ARV or your purchase price, whichever is lower, for "Delayed Financing" transactions. 

While you can do most of the work yourself, you will need a little help from a licensed electrician and plumber to pull permits and pass inspection.

Several months ago I asked for recommendations, and BiggerPockets removed my post, telling me they don't permit solicitation in forums.

Oh, and make sure you have permits for everything you did!

If the carpenters indicate that full replacement is needed, then check with the permitting and code enforcement office to see if outdoor staircases are still allowed.

Therefore, if you are thinking about making a significant improvement to your home do it right after a property assessment and enjoy the lower taxes for a few years (this won't apply if your local tax assessor re-assess properties after permit close outs).