Plans for a major shopping center and on-site hotel on the city’s southwest side are underway.

Bourn Cos. is planning the outdoor center on Irvington Road, west of Interstate 19, and is in negotiations with several retailers, restaurants and hotel chains.

The 58-acre site will be developed in phases, with about 220,000 square feet of shopping space to come online by fall of 2017, said developer Alan Tanner of Bourn.

At full build-out — in about 3½ years — the center could have up to 600,000 square feet of retail space.

Anchor tenants will be on the west side of the center, facing I-19.

Restaurants and retailers will dot the east and south sides, facing the interstate and Irvington Road.

The site is owned by the city of Tucson and used by Tucson Water as a facilities yard.

The City Council voted unanimously last month to rezone the parcel from residential to commercial.

A required land study is being done before the sale of the land to Bourn can close. Developers hope to buy the land at the end of the month. A sale price has not been determined.