Amazon.com, the e-commerce giant that has been busy building a network of Chicago warehouses to support ultra-fast deliveries, is ordering up a new kind of worker here: white collar.

Seattle-based Amazon is in advanced negotiations to lease office space in the Franklin, a two-tower property downtown, according to sources. Amazon is believed to be seeking about 30,000 square feet in the Franklin's taller tower, a 60-story structure at 227 W. Monroe St.

It is unclear what type of office jobs Amazon is creating in Chicago, where it currently does not have an office, or how many employees it plans to hire. Amazon representatives did not respond to requests for comment.

Although Amazon will take up a small percentage of the complex, the deal could be an important step in landlord Tishman Speyer Properties' efforts to rebrand the 2.5 million-square-foot complex, whose connected 34-story tower has an address of 222 W. Adams St.

New York-based Tishman Speyer changed the property's name earlier this year from the Franklin Center amid an estimated $30 million makeover designed to appeal to a broader array of tenants.

Changes include adding a large cafeteria, a tenant lounge and bar and upgrades to the fitness and conference centers. To appeal to tenants other than law and financial services firms, Tishman Speyer also replaced dark marble and brass elements in the lobby for a brighter, less opulent look.

Updates to the property come as Tishman Speyer braces for the loss of two anchor tenants to new office towers under construction along the Chicago River: investment firm William Blair, which will move to 150 N. Riverside Plaza, and law firm McDermott Will & Emery, which is going to River Point at 444 W. Lake St.

“In securing Amazon, Tishman Speyer will have done exactly what it set out to do,” said tenant broker Ari Klein, an executive director at Cushman & Wakefield, who is not involved in the Amazon deal.

“With Amazon going there as a first mover, that will open up the Franklin to be viewed by tenants that wouldn't have looked at it before,” he said. “This deal wouldn't have happened prior to the renovations.”

Chicago's growth in the tech sector has filled many of the city's older buildings, such as the sprawling Merchandise Mart.

With downtown office vacancy below 13 percent for the first time since 2008, some creative and tech firms are taking space in more traditional office high-rises, as seen in Facebook's recent lease in the 12-year-old tower at 191 N. Wacker Drive.

Office tenant broker Steve Steinmeyer, a managing director at Chicago-based Jones Lang LaSalle who is representing Amazon in the deal, did not return calls.

Amazon's office deal follows the company's confirmation earlier this year that it plans to hire 1,000 full-time workers at a large fulfillment center in Joliet.

To offer one-hour deliveries on many products, Amazon also is creating smaller warehouses in the city to get closer to urban customers. Its first two leases in Chicago have been on Goose Island on the North Side and in the Heart of Chicago neighborhood on the South Side.