Apartments.com, a site that matches apartment seekers with units and provides property managers with a marketing platform, appears to be reaping the benefits of its recent mobile ramp-up, boosted by a campaign on Huffington Post, as sales and traffic to its site surge. As more consumers search for residences on mobile, having a strong presence here is critical for brands such as Apartments.com and could be helping drive its recent jump during March to No. 1 in traffic versus other apartment rental sites and an eightfold sales surge. The results provide evidence why businesses need to treat mobile as a must-have rather than an optional feature as consumers perform more tasks on mobile.