ATLANTA—Retailers face few more daunting challenges these days than balancing their e-commerce operations with their physical stores. Increasingly, successful retailers operate the two not as separate systems but as a combined omnichannel network serving customers across all channels: online, in-store, mobile and others.

CBRE recently started an Omnichannel Real Estate practice to help retailers manage that transition. GlobeSt.com spoke with the leaders of that practice—Adam Mullen, senior managing director and Americas Leader of Industrial & Logistics, and Brandon Famous, Americas Leader of Retail Advisory & Transaction Services—about the inherent challenges for retailers converting to omnichannel networks.

GlobeSt.com: What are the most common mistakes that retailers make when designing or building out their e-commerce-fulfillment networks and store portfolios?