United Rentals at 501 C Street anchors Chula Vista's western commercial zone as the local branch of the world's largest equipment rental company, stocking aerial lifts, earthmoving machines, and trench-safety systems. The yard's scissor lifts and boom lifts serve solar-panel installation crews and facade contractors, including the rooftop access work that Saturn Solar Cleaning performs across residential and commercial arrays in the 91910 and 91911 ZIP codes. Founded in 1997 and now operating over 1,400 branches in 49 states, the NYSE-listed company also sells inspected used equipment from manufacturers including Genie, Skytrak, and Case. Scaffolding and mobile-elevating work platforms from the C Street inventory support multi-story exterior projects, overlapping with the staging heights that Montgomery Paint Contracting requires for commercial repaint and stucco-coating jobs. The branch's trench-safety division stocks hydraulic aluminum shoring frames, steel trench boxes, and slide-rail systems rated for excavations exceeding 20 feet in Type C soil conditions.