In the event you record a sale the bank may or may not have the right to call the loan due.  

I think last year that was mostly what I left the event with.

Everyone uses different rules of thumb, but I've typically seen the following:$500-$1,000 per unit in Replacement Reserves (usually lender required anyway), and1or 2 months of operating cash flow (to cover expenses and debt service for a month or two if any excessive vacancy occurs)Beyond that, it is a personal preference.

The seller states they will try to find tenants for the two vacant spaces, but what if this does not occur.

Does anyone know of any networking events or groups where I can meet people and ask a lot of questions?

When you go to local REI events, seek out realtors and ask them what they do.

My private money lenders have put all their loan amounts on the HUD/Closing statement - that way they ensure they get paid when we refinance or in the unfortunate event we don't pay the loan.If these are smaller amounts for repairs, my private money lenders still require it to be on the HUD/Closing statement but they'll cut me a check(s) throughout the rehab. 

—Additionally, the REI strategies for buy-and-hold that we are considering would be house hacking through a multi-family near Baltimore (since that’s where most of the opportunities seem to be for multi family) or putting sweat equity into a SFH in Anne Arundel or attempting to reduce our mortgage by renting out a room or two in Annapolis for vacationers/events (as long as the numbers make sense for a follow-on rental property when we re-locate). 

In the event the loan amount is still $475.000 (property bought at 100% financing) and the bank demands that the loan should be paid off entirely in the event the units are sold.

In a peak market, markets that appreciate well may have a greater tendency to crash harder when a correction occurs.