CEDAR RAPIDS — Milton Gray, 56, and Tom Mason, 53, are two of the regulars at Greene Square, the city’s oldest park, located downtown between the public library and art museum. It’s convenient, they say, and often thriving with people. Access to air conditioning in the summer, heat in the winter, restrooms and Wi-Fi can be found at the library. Public transit and free food courtesy of Green Square Meals and Waypoint are nearby. Plus, it is nice, they said — and it should be, after a $1.9 million renovation completed in May 2016 introduced a splash pad, charging stations, an avenue of trees, updated seating and a coil-like sculpture that serves as a backdrop for graduation and wedding photos. It is a hub for all types of people.