Or tenants know they are the owner and take advantage of that. 

If it’s tied directly to the lender as part of your mortgage agreement, you’d probably need to negotiate with them or refinance with a different lender who doesn’t require that restriction.However, if the restriction is part of the property deed itself and was placed by a previous owner or another party, it can be more complicated.

Alternatively, your sibling might use a 1031 exchange to defer taxes by reinvesting in like-kind properties, though this doesn't directly fund a primary residence.Other ideas include leveraging a HELOC on the rental properties for the down payment, taking out a 401(k) loan, structuring an owner-financed agreement, or a lease-to-own arrangement.

Live in one unit - It's a great strategy when using a bank for financing as the down payment and interest rates are more favorable to owner occupants.  

Secondly, short-term rentals provide flexibility for owners, allowing them to potentially use the property themselves when not rented out.

@Zen Lenon, I'm not dealing with HOA's at scale but I agree that MTR owners need to check their HOA rules to make sure the strategy works for them.

It also allows you to search 400 property and property owner consumer fields, in addition to being a driving for dollars tool.

Quote from @Rafael Ramos: I’m Rafael, a business owner based in Florida, and I’m looking for some advice to craft the best real estate investment strategy.

Housing is apparently a human right that's owed from the owner to the renter.

Cheap homes for an area are cheap for a reason - low to no demand from local investors or owners.