Find out later that is a "Private" hydrant forthe Apartment complex you bought the excess land from.

The number of units probably has less influence than the nature of those units.A 200-unit apartment complex will run very similar to a 100-unit or 300-unit apartment complex but will run very differently than 200 SF rentals or even 10 20-unit apartments.  

@Christopher OlsonWe currently own 6 apartment complexes and every one we’ve purchased off-market.

It does get much more complex in terms of accounting and business banks, business credit.  

But you also state that "there is no other option", which means that the Seller can take their sweet time, they have you by a hook.

For travel nurses in-unit or at least W/D available in the complex is a huge advantage.

It gets pretty complex fast. 

Rent to Rent, Buying a house with your own money, buying a single family home, apartment complexes, trailer homes, air bnb's, short terms.

I'm looking for opinions on what a "sweet spot" would be for a good deal in your opinion.For example, properties I'm looking at pass the 1% rule, and 50% rule, and need about $40k in total investment to get market rent for all units - where the house would make 54k per year in rental income, before all expenses (about 50%).

If it is an existing complex, try to see if you can renovate the majority of the building or raise rents but I would use leverage since I believe a refi boom could occur at the end of 2023 or beginning of 2024.