However, my mother has fully paid for the property, making her the rightful owner in practical terms.

What new apartments are permitted around it...or 1/2 way thru construction, but not on the market.How do you become an expert or master it.....probably like any other skill...practice. 

The similarities are strong with the brothers with their behaviors, such as, suspending distributions to investors and other poor business practices.

A great resource to check out is The Frugalwoods—they share practical strategies for cutting food expenses without sacrificing quality.

Final Thoughts In my 27 years of practice, I’ve encountered fewer than 20 cases of loan acceleration, and most involved creative financing or FHA loans.

As a six figure earner, I am seeking advice and insights from experienced real estate investors on strategies and best practices that were valuable when starting out!

Find Brandon's videos on YouTube for the "four square" method of analyzing homes and practice.

Any specific regulations or best practices to be aware of?

With the lack of housing and the cost of everything going up, more moderate practical housing spaces might be a thought. 

Wholesalers (no offense to those in the comments) who are doing this without being a foreign entity are probably co-wholesaling which is on the borderline and practically acting as an agent without a license or getting referral fees by having actual wholesalers on the ground doing deals and they just provide the leads which is different than wholesaling.