What I mean is that on most products on a investment property 2 unit building the max loan to value is going to be 70% or maybe 75% loan to value.

Moreover, you'll receive more favorable terms/rates utilizing a primarily home loan product than an investment loan. 

Know the lenders requirements for the loan types you will need.For instance you may find you need to have liquid cash of 9 Months P&I and 100% of the loan amount as your personal net worth in order to avoid personal guarantees on the loan, and your retirement accounts may not count towards your liquidity.Know the requirements of the loan products for the apartments you want to buy.There are no books for that, that I know of--just lenders info.Because without that all else is just scholastic exercise.Good Luck!

Production depends on the owner and the home. 

Not sure what that product is. 

Quote from @Logan Ransley: Hey Matthew, fantastic and in-depth constructive feedback about our product.

Not only in building wealth by starting early, but also just everything you're learning about life and being a productive successful person.

Are these type of little to no doc products getting more common again?

Its a product we offer, just doesn't get a lot of play, because its a pain to refinance that seller out down the road.

A DSCR product is what you are looking for.DSCR simply doesn't take into account your personal income, instead we qualify the loan on the properties rental income (or projected rental income).Your credit, properties cashflow, loan to value & prepayment penalty are going to be the main determinants on what this loan looks like for you.