I think its best to try and find a local bank or credit union to finance this. 

Local Credit unions and small regional banks.  

For your client's cash-out refinance on an adult family home in Washington State, it would be helpful to reach out to lenders who specialize in DSCR loans, especially those experienced with unique property types like adult family homes.Contact Local Lenders: Start with local banks and credit unions in Washington that offer DSCR loans, as they may have specific programs tailored for adult family homes.

Hello, if I have a HELOC on a primary home and I move out to convert the house into a rental property, do credit unions/bank typically have an issue with that? 

Additionally, getting rid of a tenant in an illegal unit isn't easy in Union City. 

Some local credit unions and banks can offer great terms in the 75%-80% LTV range.If you’d like, feel free to reach out directly, and I can share some connections that have worked well for me over the years.

(DCSR, Private Lenders, Credit Union banks etc.) 

Another credit union here (I believe they lend in Colorado too) has a no income limit 0% down program.

I would think most landlords, who choose to be landlords in very Tenant friendly San Francisco, would pony up the 5.2% knowing that the rate has gone up and down throughout time, unless they want to run the risk of their tenant's finding out and called out as being a bad landlord, being taken on by the very helpful San Francisco Tenants Union or taken to Small Claims Court.Maybe there is a silver lining in California's recent change in security deposits that limit it to one months rent when it used to be up to 2 month's rent for unfurnished units and up to 3x for furnished units.By the way, I took a look at your Company, https://www.getwhale.co/  Since your firm is only offering 4.2%, were you trying to market in San Fran before discovering the Rent Board rate?

Check the local credit unions or small regional banks.