So before I transfer ownership back and start a seasoning period, I thought I would ask if there were any solutions I am not finding.  

.: Quote from @Jennifer Turner: Has anyone ever sold a property with seller financing then later extended the repayment period or modified the terms of the loan with the buyers?

I was considering taking out a $240K HELOC with a 10-year draw period and pulling $160K from it to build the next rental property.

You said in your post  "If the notice was delivered by mail then the notice period begins when the Tenant actually receives the notice."

I am trying to calculate my returns over a 10-year period using the rent-by-room strategy, which results in significantly more cash flow than traditional rentals.

I doubt if you'll have any issue with your hold period since it is all about your intent anyway.

What is the time period required before refinancing?

Census Bureau, Texas added just under 563,000 new residents between July 1, 2023, and July 1, 2024.Florida came in second, adding 467,000 new residents over the 12-month period, and California came in third, adding 233,000.

If I only need a small amount for a short period of time, a HELOC works great although rates are variable.

Then have a 6 month period to convert all old currency $20 and $100 to new currency.