In addition to the proposed merger between Sprint and T-Mobile and its planned consolidation of cell sites, providers such as Verizon and AT&T are trading their interests in towers and other wireless deployments. AT&T started the ball rolling when it revealed it had entered a $4.85 billion deal with Crown Castle to lease 9,100 towers, and purchase another 600, from AT&T. That deal was soon followed by Verizon announcing it was transferring operations of its cellphone towers to American Tower Corporation.   Cell tower landlords, which can include private businesses and local government agencies, should be aware that there are different and detailed issues to be addressed when a tower operator — as opposed to a traditional provider —  is the other party in a rooftop or ground lease. In 2015, we offered a Landlord’s Checklist for Cell Tower Transfers and, in response to recent developments, we’ve updated the checklist to help landlords protect themselves amid the turmoil of the merger of the country’s 3rd- and 4th-largest mobile carriers. This updated list also addresses the transfer of a rooftop, ground lease or right of way vertical infrastructure license from a traditional provider, such as AT&T or Verizon, to an infrastructure host, such as American Tower or Crown.