Irvine-based RealtyTrac, a provider of data about foreclosure properties, said today that it has expanded an agreement with PRIMEDIA, Inc., a publisher of real estate information and web sites. According to RealtyTrac, the deal will allow users on a number of PRMIEDIA web sites to search for foreclosure properties using RealtyTrac's database. Financial terms of the agreement were not disclosed. The web properties in question include americanhomeguides.com, rentals.com, and rentalhouses.com. PRIMEDIA is the publisher of Apartment Guide.