You can sell and put the 400k in a risk-free, no hassle, US Treasury or CD and earn a 5% return; so, that should be your floor for total return expectations. 

Longer-term loans are normally backed by Wall Street traunches and fixed, long-term Mortgage-Backed Securities that look a lot like a long-term Treasury.

With silicon valley it was treasury bonds and with first republic it seems like it was mortgages. 

From a very high level the quality of life for the average American in particular is likely to decline as there is less appetite for US originated debt and treasuries. 

US Treasury bills are paying up to 5.2% on shorter term maturities.  

But I'm sure as there's more and more acceptance, the treasury will come up with a way to want their share of it.Retailers like Amazon, Sears, WHole Foods, Staples etc are all accepting bitcoins.

Treasury is seriously considering a refi program for purchase and refi at 4%.

Assuming zero appreciation then sell as you could invest in treasuries and get a better return but if appreciation will continue that’s a different story

Department of Treasury with usc exceptionState Tax LienLien by USA or Dept of JusticeUS Department of StateOther Federal AgenciesFrequent Superior Foreclosure-Liens: HOA or condo feesCode Enforcement for debris removal or mowingDemolition or Environmental Based LiensState child support lienBoard of County Commissioners for special assessmentsUtility LiensWater/Sewer Delinquency (only in selected states)County (and/or School/Township) for unpaid taxesCity for road improvements, maintenanceHere are some of the judgment and liens that will be wiped off from the property (not the borrower who lost the title) if the lien holders were properly notified and "had the right to bid on the property at the auction": 2nd and junior position mortgages, such as home equity loans, etc...Credit Card Judgments recorded after the foreclosing mortgagePersonal Judgments recorded after the foreclosing mortgageMechanic's Liens recorded after the foreclosing mortgage

Some tie the variable interest rate to Treasury, while others tie the rate to LIBOR.