Phase 1 of IOI City Mall opened in November 2014 with a net lettable area of 1,500,000 sq ft (140,000 m2) across three levels with 350 tenants.

[2][3] The Phase 1 section of the mall also features District 21, a post-apocalypse themed recreational park, two ice skating rinks, an edutainment exhibition space with an “indoor living planet” concept, and Golden Screen Cinemas with GSC Maxx and 4DX halls.

[4] IOI City Mall is located near the SKVE South Klang Valley Expressway with over 16,600 parking bays provided.

All the bus routes stop at the terminal hub located in P3 floor of Phase 1, which is shared with the motorcycle parking.

Since February 2024, IOI City Mall and the nearby locations in IOI Resort City is also accessible via Trek Rides demand-responsive transport (DRT) service powered by Selangor Mobility under the UPM-Serdang zone, with  PY34  MRT UPM station is the nearest public transport stop for the service.