If you are sole member LLC you just take a distribution from your business account to your personal account.You are likely already reporting the income on a schedule E.

My goal is reviewing retirement options. 

We saw huge appreciation in the 2018-2022 inflation run up, but that has significantly slowed these days in my opinion.From a rental perspective your monthly income per unit after all expenses with a typical 20% down payment is likely $100-300 when you find a property that will cash flow.

My brother who is civil service and retired military.  

Done right just the first house will give the owner the ability to retire for life after the mortgage is paid. 

In any case, you can easily calculate that.Looking at your objective of retiring in Costa Rica, you have two options:1.

I am not unsure of your current income & life circumstances.

Additionally, since my parents are nearing the retirement age, I'd like to prioritize low-debt, high-cashflow deals.

I jumped into real estate doing the BRRRR method, understanding that holding property will allow me to build generational wealth, but then learning that landlord income is not the best way to feed your family.

Quote from @Travis Smith: Age 56 and retiring from farming and I’ve been very good at avoiding income taxes with depreciation and business expenses.