If the property is owned by a bank that will be reflected on the property tax records. The owner, whether an individual, corporation or a bank, has to have their name and address recorded so the county tax official knows where to send the property tax bill. Call the county and ask them who owns the building, it's public record, they have to tell you.
A title company search is the best & most current a nominal charge ... public records of the tax assessors website of the county where you're rental property is located is reasonably accurate but may be outdated as they are 1 week to 2 months behind in recordings and electronic filings. If it is bank owned you would have been noticed by the sheriff or by a foreclosure notice served on the property. Just curious, what is the importance to you of this?