How to file a lien on the property that's been sold?

Hi there,

I'm working for a contractor and we've completed a 6 plex job that's been burned. The owner of the property started to sell the building even before we finish and she sold it as soon as we completed the job. And then she's not paying us a final payment. I'm just wondering if there's any way to file a lien on the property that's been already sold. I talked with somebody of her mortgage bank and it's been paid in full. I guess it means the new owner already bought it.

Please let me know! Thanks:)

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