The Diamond Children's Medical Center at University Medical Center had a ribbon-cutting ceremony Wednesday night and will officially open its doors to the public Tuesday.

The new lobby is the old UMC emergency room entrance - on the east side of the UMC campus near North Campbell Avenue and East Elm Street. Parking is available adjacent to the new lobby, and additional parking is being developed in an indoor parking garage just north of the new entrance.

Non-emergency pediatric patients and their families should enter through the new entrance. A pediatric emergency entrance is on the northwest corner of the UMC emergency department on Warren Avenue.

At Diamond Children's, hospital officials have created a colorful, interactive lobby designed for children. It has towering metal trees, stars on the ceiling and a faux Canyon de Chelly on one wall with touchable petroglyphs. There also are murals, a canopy, a large telescope and stage, and a children's library with a child-size door. Several sculptures, murals and benches were donated by local families, some of whom have lost children to accidents and illness.

A train donated by the Tucson Garden Railroad Society travels above head level through the lobby and loops into a new gift shop. A kid-friendly cafe has a Route 66 theme.

Diamond Children's is a partnership between University Medical Center and the University of Arizona Steele Children's Research Center, merging clinical and research components into one facility.

It's part of a $200 million expansion at UMC and is named for developer Don Diamond and his family, who donated $15 million to the pediatric medical center.