Be sure you have cash flow to pay the monthly payments on the HELOC until you’re able to refinance out the new property.

If there are common areas in the commercial property, then sure you would need to do the accounting regarding who pays what and what's collected among the various tenants. 

The most common benefits a landlord can get from an arbitrage agreement are: reduced vacancy expense, decreased maintenance costs (most arbitragers agree to fix any damage done by guests), increased rent (most pay a premium), reduced number of hours managing the property (aka it's more passive)Some less common benefits, but still worth mentioning: Using the property to host their own guests at a lower rate during the "vacation season", Revenue sharing, arbitrage managing landscaping, and other management tasks. 

FYI I am planning to talk with my CPA about this but I want to let him finish my return for 2022 first before I ask/pay him for his time.

If no amount is stipulated, Tenant must pay Landlord’s actual reletting costs as far as they can be determined.

A little about my situation: I am a 33-year-old single mom who has finally gotten her finances in order after getting my Bachelor’s degree in 2022 which allowed me to get a high-paying job with great benefits (401K + matching). 

I got a tax lien list and an unsafe structures list from my county.

Just in maintenance, PM, and vacancy expenses the $1800 is mostly gone... not to mention landscaping, snow removal, insurance, prperty taxes, cap ex, etc...

I open to pay in order to know the real numbers Thank you

I've been paying aggressively to free up funds to borrow at the 3.99% as needed.