The 8 mos isn’t quite long enough to utilize just the STR income to qualify but many lenders allow AirDnA projections to be utilized as the income to qualify.

Anything greater than 5+ units is considered commercial and usually underwritten based on the occupancy and rental income. - For greater than 5+ multi family properties the 'best' initial source for financing could be a local credit union or bank.

This truthfully offers no additional liability protection.

Owning multiple types of multi-family rentals (Class C and B for now), I have a good grasp of the value, in addition to just public rental data, so not really a problem for me.

Additionally, LLCs can provide tax benefits through deductions like mortgage interest, property taxes, repairs, and depreciation.

She did not qualify for the new loan without using the rent of the old house as income.   

**Additional Tips**: Any other advice or experiences from those who have successfully managed medium-term rentals would be invaluable.I want to ensure that my contract is clear, fair, and legally sound.

Are there other types of loans people use to pull equity from their rental to purchase additional properties? 

If the properties are split into more than one LLC, then each LLC will need its own accounts.Checking: collect all income here, then use it to pay bills.

You will need additional protection.