Prices are sky rocketing with interest rates for Seattle/Bellevue/Bothell etc ,is it still good time to buy or wait?

If the loan amount is above $1MM, and you have stabilized the property, you can wait 90 days for up to 80% of the appraised value.  

Any recommendations on a company to provide inexpensive insurance on a vacant house while waiting for it to sell? 

I suppose I was waiting for an ideal time, but it has become obvious that the timing will never be ideal.

I don't want to wait to take the saved income and equity to buy more property.

Is there anything else I should be doing other than waiting? 

Of course the seller does not want to wait.

I have recently invested more capital in MHPs and SS but am starting to participate in some MF offerings (got wait-listed on an offering last night).I often hear that they are not building B class MF but I see it some in the southeast. 

Wait 2-3 years and save for a downpayment of a SFR and skip the whole ADU hassle. 

Some banks have different requirements, but two that I work with structure loans as follows:Bank 1:  is a local portfolio lender, requires a 6 month season period, does 15-20 year notes with 5 year variable interest, super quick turn around on refinancesBank 2: is a credit union that does commercial loans, doesn't require a seasoning period, but does require a lease to be in place, does 15-30 year notes, rates vary depending on note term, and they will allow a 10 year period before the rate changes, super slow turn around on refinancesI opt for option 1 because I don't like to be slowed down for 3-4 months waiting for a refi, but I also have a great relationship with my bank, and tell them what other lenders are doing and see how closely they can match the competition.