Cash flow (in my portfolio as a whole) covers my expenses.

If it were me, I'd tell my brother than I get my downpayment back first, then we split and additional profit at sale 50/50 (presuming he matches your other expenses).

p16  "Salzano used this money, much of which was traceable to Fund investors, for an array of lavish personal expenses, including erectile dysfunction medications, expensive dinners, extravagant birthday parties, and payments to Individual-4 (Salzano’s wife), Individual-5 (with whom Salzano had a romantic relationship), and Individual-7 (Salzano’s ex-wife), none of whom worked at NRIA in any capacity."

Construction loans are available in Mexico but its a complicated and very expensive process.As a developer, I find and buy the land, plan and obtain all the permits, recruit a general contractor, market and sell the condos to investors who either use them for part time living or list them on AirBanB. 

So about 1,100-1200 monthly expenses after groceries and other miscellaneous things I’d say.

I know it's talked about all the time, but I recommend people leave their equity and focus on increasing income, cutting expenses, and saving for the next investment.

It would be a good project for a custom builder, but I would think that the guys who are building big expensive houses would probably just want to buy the lot outright to keep more of the profit (understandably so). 

Although I wouldn't recommend a 10 year career professional to dive head first into Real Estate and quit their job on a whim, you're in a position where you have your entire life in front of you and likely have yet to incur debts that need to be paid and other real world expenses.  

You should use either LLC’s (the old and expensive way) or a Series LLC (the new and more cost/time effective way).

Those loans are expense and I do not recall them going below 7%.