An amendment Thursday to a bill in the Colorado Legislature on voluntary rent-control agreements has led the Denver Metro Chamber of Commerce to drop its opposition to the measure and remove it from a list of six bills that it was asking lawmakers to kill, The Denver Business Journal reports. House Bill 1017, sponsored by Rep. Daniel Kagan, D-Denver, changes a 29-year-old provision in state law to allow private developers to enter voluntarily into rent-control contracts on their properties with counties and cities.