At least in the state where I live (WA) which is a non-recourse state is very hard (I would say impossible but that is a high bar) for an individual or a family

At least in the state where I live (WA) which is a non-recourse state is very hard (I would say impossible but that is a high bar) for an individual or a family to use existing real estate equity to buy more real estate. Me and my wife own 4 properties. Each time we bought a property it was through a different lender (the cheapest one with the lowest interest rate). When it came time to existing rentals the paperwork wanted to know the lease agreement for the current tenants, monthly expenses and monthly rental income. There was no question about mortgage principal, nor about market value of real estate. When we bought (yet) another property, the lender could not (and did not) use the existing real estate assets to secure the new loan. Each loan was secured by its property and nothing else.