Missouri’s football fans are savoring plans for a new NFL stadium in downtown St. Louis, but it remains unclear if the HOK-led designs will be enough to keep the Rams from leaving.

In January fans of the St. Louis Rams got new reason to fear their football team might depart when owner Stan Kroenke announced plans to build an HKS-designed 80,000-seat stadium in the Los Angeles suburb of Inglewood.

Twenty years after the NFL team left L.A. in the first place, they may well move back—but not if St. Louis officials and fans have their way. New renderings released in March give more substance to plans that could woo the Rams into staying: a football and soccer stadium on the banks of the Mississippi River designed by St. Louis–based HOK.

The National Football League has said no team relocations will happen this year, but either stadium plan could be ready for construction in 2016.