Pima County was named in a lawsuit Thursday challenging its decision to approve borrowing of $15 million to build a balloon-launch spaceport near Tucson International Airport. The Goldwater Institute, a conservative think-tank in Phoenix, filed the suit over the county Board of Supervisors’ January decision to fund World View Enterprises headquarters and a balloon launching pad. World View conducts sub-orbital launches and is preparing to take commercial payloads and tourism trips into the stratosphere. The lawsuit said the county’s action violates the state Constitution because it gives more value to World View than the taxpayers get in return. … The Goldwater Institute also accused Pima County of agreeing to the arrangement in secret, then using an emergency declaration to skip the competitive bidding process for the architect and contractor on the facilities.