If there is a lot of equity and/or if the properties are a large portion of your net worth, I might do 2 separate LLCs but, in most situations, having 2 small properties in one LLC is fine.

Collecting the tenants portion can some times be near impossible.

Looking to buy some Multi/Single family properties in Philadelphia and I'm looking for any and all recommendations as to what is a good portion of the city to buy, great property managing groups, etc!

"adequate reserves" (money in the bank) is what many refer to as vital to get through times of unexpected rental income loss.

You may be a "Preferred Type".If you don't come across as a Hobo or a Tramp, and your demeanor is not scary to people, and your not actively using drugs, you're best bet to solve the problem quickly is to look for a room mate situation.Try to find someone in your general age bracket who is renting a room (Craigslist roommates wanted).Don't be too picky at first about fixing old furniture, just get inside and then try to move up later.Then be a good "Clean" roommate who causes no problems and pays your portion of the rent on time.You can find these situations in apartment complexes and in homes.Some will be month to month vs a longer lease. 

@John Lindenauer I currently use Equity Trust for my SDIRA to which I have a portion of it allocated in a TD Ameritrade brokerage account that I control.   

The way we are structuring the deal is my daughter will come in with half of our portion of the deal.  

Conservatively underwritten debt is a safer portion of the capital stack because if the property fails to meet its debt payments, the investor forecloses and owns it (instead of losing everything after defaulting on the loan on an equity investment).

Even gutting and doing the demo (cheap) portion might be a good idea.

Let Collections handle it, move on, and be thankful if you collect any portion.