Hi there,It sounds like you're looking for some advice on how to navigate a complex situation with your brother and your wife.First, let's address the joint account and mortgage issues.

Growing to the large number you are looking at in the time frame you want will require outside equity investors and will require a large team to help manage and support your work (at which point you'll probably move to apartment complexes rather than single family homes). 

However, this approach might add complexity, such as additional tax filings, self-employment taxes, and administrative costs.

If you see yourself owning 2-3 apartment complexes, I would start with at least 4 units, maybe even 8-16.

As I look at it .. there could be simple ways to "Spruce it up" and then there can be more complex ways.

@Brody VeilleuxHouse hacking and BRRRR (Build, Refinance, Resell, Reinvest) strategies are effective for property acquisition, but they carry risks like delayed refinancing, increased debt, and property management complexity.

I’ve heard good things about some of the newer online options, but make sure they can handle the complexity of a growing real estate business.I had a friend in Scottsdale who ran into an issue with her lenders when she tried to close on her second property.

.: There are ways for him to sell the property to you even with a mortgage, but there's a lot of complexity involved and I don't recommend it.

With condos, sales in the same complex would be most similar. 

Augustine most oceanfront condo complexes do allow some form of STR.