If you're unsure of who the landowner is, you can reach out to the Housing Strategy team at Scottish Borders for assistance. They manage the Private Landlord Register and can provide the necessary information.
You can contact them via phone at 01896 661392 or use the email for the landlord registration mailbox: privatelandlordregistration@scotborders.gov.uk. Additionally, you might want to check the Private Landlord Registration page for more detailed information.