HPP Lot sales & Shade Tree

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Has anyone else sold their HPP lot to Shade Tree and not had it close? I sold my lot in Aug 2007 and there has been extension after extension and still no closing. Now the buyer is offering $2500 early payment from escrow for each extension. I received 1 payment and now the 2nd one for 18 Feb has not been paid.

I have gone through a broker with signed contracts but this is a new experience for me. Are there any lawyers on this board that I can contact?

TIA

Rgds
Marshall from Switzerland