Is there any chance of getting a residential loan on this?

You will need 20-25% down and a commercial loan for the rest.Most lenders will want to lend to an LLC with you personally guaranteeing the loan.Typically, each MFR would be purchased under its own LLC, for liability purposes.Each LLC would then also need its own bank accounts for collecting rents and paying expenses.

I do not want to change the loan terms, only the % interest rates. 

You can also structure the loan to give you a little extra cash flow in the first couple of years.

The loan amount is $220000, and the estimated Zillow price for the home is $600k.

Consider factors like neighborhood, school districts, and proximity to amenities.Financing and Mortgage Considerations:Investment Property Mortgage: Understand that an investment property mortgage may have higher interest rates and require a larger down payment compared to a primary residence mortgage.Future Refinance: Consider the possibility of refinancing the property when you decide to move in, potentially lowering your interest rate and monthly payments.Loan Types: Look into loan types that might offer favorable terms for investment properties, such as conventional loans or FHA loans if the property meets the criteria.Rental Management:Long-Term vs.

Also some states do not allow you to seller finance if you have an existing mortgage - others require the sales price to be above the existing loan and cannot mature before the existing loan.Definitely need to get an attorney involved who handles state compliance

I had already been doing projects on the house and over the course of about 8 years I had made quite a few improvements.

If there is an existing mortgage in your name it should be disclosed that your name will stay on the loan for possibly a very long time. 

So, unless you did some substantial improvements were made you may or may not have an appreciable difference in equity.