I’ve called a few and some have even said there is a two to three year waiting period citing covid + high demand + supply chain issues.

Cash purchases should be avoided, you will loose credibility with your partner.A cash withdrawal from the company account might be broken out for small supply purchases, for example, or copying a key, but each purchase must be verified with the receipt; receipts will match the total cash withdrawal.  

Housing supply is at an alltime low, as is labor availability.

In the lease list contact options and give them an emergency contact to be used outside of regular hours in the event of an emergency (eg burst pipe).

It could also lead to increasing price of multifamily buildings, due to effectively increasing the money supply, if the rent amount do not change as well.  

Telling the residents how to turn off the water supply valve is the easiest solution and the rest can be solved later. 

A regular bank cash-out refi requires at a minimum six months of ownership.I was thinking of using a HELOC to get the equity out.

In a trailer park, you don't pay property taxes.As others said, mobile homes don't appreciate the same way as a 'regular' home and insurance is a lot more.I have one that is on its own lot and I had no problem with getting bank financing. 

Property price surges up because it has a function of supply and demand.

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