I've added a few things for very minimal cost that guests really love and increased revenue ~34% year over year.

Current financing available, construction costs and how to reduce them, appraisal trends, best practices when building on investment properties, rental values, design trends, how to minimize the construction time, which cities are helpful and which aren't, etc.

Obviously tough to give advice based on minimal info and no info on your personal situation.

If you have insights on creative ways to acquire rental properties or storage facility businesses with minimal capital, I’d love to hear from you.

Conceptually you want to take an approach that minimizes your need to be on site - and for that reason I would advise against BRRRR.

Holding Costs - My experience with owner financing is that I can buy and sell a property in a month or less since the rehab is minimal and I'm providing the financing.

Purchase Terms: Clearly outline the terms for your brother to purchase the property from you, including the timeline and price.To minimize the financial burden on your HELOC, refinance the property into a traditional mortgage as soon as possible.                                                                                           

They pay a minimal interest (around 4%) on account balances, and you can categorize transactions (much like Quicken if you're familiar with it).

To minimize time the property is vacant, have the Realtor coordinate with the existing Tenant for the last 30 days of their occupancy for showings so you have the best possible chance of securing a new Tenant without a break in between.I would love to know some of the details of your property, and do a rental rate check up to confirm you have the right price. 

It’s crucial to consult a real estate attorney and tax advisor to structure the transfer in a way that minimizes tax consequences and aligns with your objectives.