It seems like Kevin's advice is the way to go.  You can't force the developer or the title company to pay it, but I think you will find them much more willing to open their checkbook when the new owner, or the bank, calls them to make a claim on the policy.

The question I would have is, can you get attorney fees from them?  Depending on the amount of the lien, any payment may be insufficient to cover the costs of the foreclosure unless you can get attorney's fees too. (Kevin?)

I would have my attorney call them first (a phone call is much cheaper)... sometimes a call from an attorney can do much more than a call from the lienholder. 

Robert A. Franco
SOURCE OF TITLE