A business line of credit through your LLC protects personal assets, builds business credit, and may allow interest deductions, but it might be harder to secure for a new LLC.

The DCA has on file that the property is only a four unit building.

Those that choose and can rebuild, will most likely not build back to the extent or scale due to feasibility or costs or unanticipated new zoning, infrastructure, insurance and legal variables.

A reserve is unnecessary, but I still keep around $15,000 - $20,000 in my account.The point is, that you should sit down and assess your finances to determine what the worst-case scenario may look like, how much you would need to cover it without impacting your life, and whether you will need to build a reserve.

I'm working with a company who owns a small, 19 unit, senior and low income apartment building.

Our negotiation approach focused on building rapport with the seller, allowing us to secure the property below market value.

.$100k per building, I'd say not usually. 

You want to build a relationship.  

Quote from @Spencer Elliott: Long story short, land is on loan and I’m purchasing a manufactured lot as a temporary home/future ADU to my final build.

These would be bare rental units where tenant builds to suit or we could with appropriate rent charge.