Final answer:
DR Horton and PulteGroup, Inc. are two influential companies in Illinois's construction real estate market, both renowned for their extensive range of homes and innovative designs.
Step-by-step explanation:
Two key players in the construction real estate market in Illinois are DR Horton and PulteGroup, Inc. DR Horton is one of the largest home construction companies in the United States, known for building and selling homes for a variety of markets, including first-time, move-up, luxury buyers, and active adults. PulteGroup, Inc., which operates through its subsidiaries like Pulte Homes, Centex, Del Webb, DiVosta, and John Wieland Homes and Neighborhoods, is recognized for its innovative home designs and builds ranging from single-family homes to townhouses and condominiums.