@Stephanie York  My clients often buy sight unseen, but I usually do a walk through and send them video.

New to apartment building investor and would like to employ value add strategies to build equity and wealth,cash flow should be positive.But my main concern is to build equity and wealth.So my target should be mom and pop properties,but as far as I worked with different brokers and research different market,it seems this kind of properties are really difficult to find.Any experienced investor can share insight here?

Death is obviously difficult for any family, as is the following estate proceedings and such.

I am currently a property manager of various types of properties ranging from multi-family, single family and shared rooms with somewhat difficult tenants at times.

What that will allow you to do is setup a US Bank account.The fact of the matter is that traditional bank finance is difficult to obtain (especially in the early stages).

Welome to BP @David Doheny,I would say other than those things you have listed, start talking to potential clients.

I pride myself on being there for my clients 24/7 (respectfully of course, we Realtors do need our family time).My past clients have been happy with my "turn around time" when making offers and keeping the sellers agent on track and keeping the transaction on pace.

Then put the forms for buying in one folder and selling in another folder so that you can review them before going to meet a client.

Next, adding interest to an underlying loan, several issues, but your interest rate won't match the principal owing on the underlying mortgage this makes tax reporting and borrower disclosures difficult, beyond the financial scope of any small investor without a loan compliance department. 

Gaining trust in your ability to manage someone's money is paramount, and you don't appear to have a track record so it could be a difficult sell.