NEXT GENERATION REALTY, INC., an Iowa Corporation, and HOMEBUYERS CONSULTANTS, an Iowa Corporation, Appellants, vs. IOWA REALTY COMPANY, INC., an Iowa Corporation d/b/a IOWA REALTY, FIRST REALTY, LTD., an Iowa Corporation d/b/a FIRST REALTY, MIDAMERICAN ENERGY HOLDINGS COMPANY, an Iowa Corporation, and DES MOINES AREA ASSOCIATION OF REALTORS, an Iowa Nonprofit Corporation, Appellees.