There are many service companies that will manage seller finance notes including the payments, escrow accounts, and documentation. 

Work with a qualified tax advisor on filing all of this including filing the 990T return for the IRA.

For a variety of reasons, including keeping this potential project "need-to-know" only right now, I want to get a ballpark estimate with full understanding that the goal posts could move in either direction as the project gets more discrete. 

Many lenders also impose additional requirements such as owner-occupancy, and/or that one lender make all of the institutional loans in the building.- The CA rules seem to have many rules related to financing such as seller must include appraisal, no balloon payments before 10 years, etc.

While this can maximize leverage and ROI, challenges include getting lender approval for seller financing, high carrying costs, and the pressure of short-term loans.

Upgrades included modernizing interiors, updating plumbing and electrical, and enhancing curb appeal.

The renovation process included modernizing outdated features, updating plumbing and electrical systems, and enhancing curb appeal.

There are tons of filters you can use including out of town owners, single family, multi fam, equity percentage…etc. https://www.melissa.com

Follow all safety requirements your Insurance Company plus city and county require.This usually includes childproof access and alarms.

My primary goal is to find the most cost-effective solution that minimizes tax liabilities, including avoiding property tax reassessment and maximizing the step-up in cost basis.