This was one of the many books I've read as I continue to build my portfolio and it was very informative for me.  

Most investors tend to start with cash and build a portfolio from there.

Collecting SFR is fine for cash flow, but very difficult to sell your 7 figure portfolio.

In June 2018, the company made their first foray into the MHC space, acquiring a 14-asset portfolio for $172M.

I tend to use the Street Address, City LLC method as I have multiple portfolios to manage and I group most of those by City/State.  

There are portfolio lenders that don’t look at your income, but look at the cash flow of the property or bank statements only versus your personal income, but you will pay a higher rate versus conventional financing.

They will only give you up to 75% or 80% of what you purchased the house for.If you are NOT doing any rehab and not trying to build your portfolio super quick, then use the delayed financing option assuming your interest on your HELOC is less than what you could get a private lenders interest for.If you are doing any work to the house, use a private lender or if the numbers make sense and you'll have enough equity (be careful, be 100% sure the appraisal will come back at what you think on the refi). 

The only assumption is so they can add to their rental portfolio because the spread is too thin to make money from a flip. 

Full disclosure though, I was in Houston for 4-5 years to build up a good portfolio of properties and a company before fleeing back to San Diego. 

That is what you need to do to ultimately build a large portfolio!