Determine in which county the land sits.
Visit the County Clerk's office for that county and inquire whether there are any liens against the property. All liens against a property must be recorded with the county clerk. Some counties also have their records online, searchable by address, saving yourself a trip to the County Clerk's office.
Pay any appropriate administrative fees charged by the county clerk for running a lien search on the property.
Access lien records through paid, online service providers, if you are unable to travel to the County Clerk's office.