Call a local defense attorney and set up an appointment. Do not discuss the contents of your conversations with anyone other than an attorney. This could be serious or it could be nothing.
You should not speak to investigators if they contact you. Hire an attorney and let them speak for you. You should also stop the work and activity related to the house.
I am a criminal defense attorney practicing in Nassau, Suffolk and New York City. The above information is not a substitution for a meeting whereas all potential legal issues can be discussed.
Talk to a lawyer, don't trust the cops, they can trick you into admitting something or they can trip you up and charge you with lying to them.
NY Criminal defense Attorney