A lot of multi family landlords are long term holders but every now and then some deals are on the market or I find some off-market people looking to sell.

To get some insight into the development process, take a look at this thread I am writing, walking through an actual multi-family development project in SoCal: Life Cycle of a CA MF Development ProjectI am an offer of help, feel free to post questions here or you can send DM. 

I have been sitting around and lost out on some multi families in the markets i'm looking at investing in. 

I have done land subdivision and develpment, and have owned multi-family, as well as commercial property. 

For example:  Will these be solely commercial (retail, office, etc) or will you be looking at residential multi-family as well? 

This could be a strong option if you decide to pursue multi-family investing. 

@Ashley GuerraTo build a profitable portfolio in South Jersey, choose a single-family house (SFH) approach with closeness to schools and safer areas, or a multi-family home (MFH) strategy using FHA loans, seller financing, partnerships, or responsible leverage of family home equity.

Especially if there is no multi families in your zoning area. 

Over $800 Billion sounds like a big number. $2,400 per person in the US. 

You could also look for a small multi family for 1 million and have the 275K (down payment) for that duplex or fourplex.