Yes, a landlocked property can be foreclosed upon--that answer you received from the clerk is very strange. Any property can be foreclosed upon if the mortgage is not paid. Sometimes there may have to be additional parties named in the foreclosure, if they would be affected by it--such as potentially, the owners of the property(ies) surrounding yours--but that's a procedural issue, not a bar to foreclosure, and can be corrected by naming those other parties. A case could also be voluntarily dismissed by the foreclosing lender or noteholder, if they felt that it was better to go some other route (like trying to arrange a short sale).