There are many options, in more traditional way, you can attend classes conducted by gurus to understand the process, people has opinions about these classes but most of the time it’s 2nd hand info.same could be done on own but it will be super time consuming.other option is to find someone from your network who is doing it and pay some money and learn and invest with them.

If the tenants are happy and paying on time, hold off conducting improvements until the units are vacant.

Find a way to partner splitting up the time to drive your target areas, research owners, conduct mailings, and make good offers.  

my guess  she may be conducting a cash business and also hiding that money from someone who wants it, maybe her husband? 

Apparently starting in December 2017, DELCO started conducting a property tax reassessment on 200,000 properties, which will be effective for the 2021 tax year.

The place has 4 bedrooms so this is without considering myself as the 4th occupant in terms of deferred spending, and also it will be a place for me to conduct my online business.

Just do your due diligence verifying income and conducting background checks if it is anything like CA tenants should be fairly easy to find.

Of course we would encourage our cash buyers to conduct a walk thru/inspection to verify/confirm our estimates.

I went through and conducted a home inspection and it was in really bad shape.

This is to the best of my knowledge as of todays date, please conduct your own research.