Arizona Attorney General Kris Mayes filed a lawsuit Wednesday against software company RealPage and nine residential landlords, alleging they engaged in a massive conspiracy to price gouge at least 100,000 renters in Phoenix and Tucson. RealPage sets prices for apartment units based on an algorithm that maximizes profit, according to the lawsuit filed in Maricopa County Superior Court. Some 70% of multifamily apartment units listed in the Valley are owned, operated or managed by companies that have contracted with RealPage…