Turns out the Kings’ “donation” of Sleep Train Arena, the team’s home in Natomas until 2016, wasn’t really a gift at all, despite it being widely reported that way. Taxpayers are paying the Kings $500,000 a month for use of the facility for three months. The expenses are detailed in a state contract The Bee obtained after filing a request under the California Public Records Act with Gov. Gavin Newsom’s Office of Emergency Services.