I figure this would be really helpful for anyone in our business.

You are starting a business. 

Scotia Bank in Costa Rica will allow you to open up an larger account as 'business owner' if you own your properties in an LLC but the process of opening an account is much more difficult. 

Positive cash flow is what's going to accelerate your REI business.  

If you find a solid, boots on the ground realtor/PM who has experience in the flip business you should be fine. 

May not be your cup of tea but they are cost efficient and they work to add passive income at a fraction of the cost to build a SFH.There are a few "Tiny Home" builders in Tampa and Manatee doing a ton of business.  

If you're an investor Broker / Property Manger in this business you get 100's and 100's of investors reaching out to you wanting to spend the day with you while they are in town.

I'm the sole manager of the business and the properties.

For example, it is not unusual for me and my business partner to buy 4-unit buildings for about $250k and be able to rent them out for $4,000+/mo. 

This is the cost of doing business.