It could favorably affect your rate.Car-loaning banks want borrowers to be insured so they can afford to make their payments.

Some lenders may seek to attract investors / stimulate growth by offering 0 seasoning requirement - especially to experienced and efficient borrowers. 

I want to invest in short-term rentals, and I'm unsure if I should borrow as much money as they'll let me and use the extra cash as a down payment on a short-term rental.

Also as another poster mentioned, hard money loan companies like to use private money and hard money interchangeably - when from the borrower's perspective they are quite a different experience.

Afternoon,              I am looking to borrow money from my parents and was wondering what contractual considerations I should consider moving forward. 

How much would I need access to in order to borrow $100k to build or rehab?

Granted, he's going to need some assets/ collateral to borrow against.

I certainly know some borrowers who own commercial real estate that do not have sufficient net worth to cover the loan for the property.

When I refinance I can either borrow just enough to pay him back OR I can borrow up to $62k more to go invest somewhere else.

For example, if you want to lend on small multifamily in your local market - then you need to understand how to underwrite that, learn what the exit strategies are, other lends that a borrower could refinance into, etc etc.