Washington is a community-property state, so the basis would be stepped-up on the entire property at the first death in 2009.  Too bad he didn't die in 2007; prices fell about 20% in the two-year period 2007-09.  They then increased 60% from 2009 to 2019, so you probably have a gain of about $75,000, less any improvements bought since the first death.  

You did file an extension so that you could sort this all out, right?