Pending sale with lis pendens

[Mel Smith]

Hi, I am the seller of a house that has a lis pendens on it.  The lis pendens will be removed once the house is brought up to code (demolished or rebuilt).  I have a sales agreement with someone that was signed a month ago and the closing was supposed to be in 2 weeks.  The buyer was informed from the beginning about the lis pendens.  Once the title search came back, the buyer will not move forward with the closing and keeps wanting to re-negotiate. I've told him no multiple times, that I'm firm on the agreed upon price since he had time ample time for due diligence and if he wants lower, then I want to void the cancel the sales agreement so that I can put it back on market.  This has been going on for 2 weeks now.  I'm feeling bullied and as if I'm being held hostage and am not sure what I can legally do.  Can someone please advise?  There are no real estate agents involved.  Thanks.