The primary listing syndication sites, along with their sub-sites are likely your best bet. 

Honestly you're best bet would probably be to house hack a place close to where you are most familiar with.

I'd also bet on more appreciation anywhere in Philly vs South Jersey.

Screening ALL your tenants rigorously, the same way is the best bet for success with a market tenant or section 8 tenant.

With covid would duplex or small apartment complex be a better bet than single family properties against a real estate down market?

I have read Joe Fairless's book on apartment syndication and he really preaches to start a thought platform.

I bet it will be prominent.

This is what actually Is costs you to get your equity, you are paying every month out of pocket.look your property looks good if all 4 units where rented your analysis that it will appreciate with out doing any value add is a bet on appreciation and rent increases year over year is a huge gamble and only pays off when you sell and if you sell at that price at the right time. 

If you do decide to cash out, you can always place a smaller bet.

an agent I usually do business with has done the same thing to me. im also in PA. learning to navigate this way of doing business has been challenging. best bet is to keep an eye on your market and be ready to strike. but just not to eager as I think prices are going to soon be in decline.