Expedia is working on a long-range master plan to expand the travel giant’s new 41-acre campus to more than 1.9 million square feet, an official said Thursday.

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Expedia is proposing a master plan that over 15 years would allow the travel giant to more than double the office and parking structures on its new 41-acre waterfront campus, an official said Thursday.

Under the scenario for most intense use, the company proposes adding up to 1.23 million gross square feet by expanding three buildings and a parking garage, and constructing five new buildings plus a parking structure.

The Bellevue-based company announced in spring it had bought the former Amgen campus on the Seattle waterfront for $229 million and planned to move its headquarters there by the end of 2018.

Expedia has about 3,000 employees and expects to grow to 4,500in the next few years at its Seattle campus.

The campus now has 750,000 gross square feet of buildings and a parking garage with 1,230stalls. In April, Expedia said it planned to build an additional 200,000 square feet.

The city had approved Amgen for up to 1.3 million square feet for research-and-development and corporate office space.

An Expedia spokeswoman said Thursday the company would like the city to raise that limit to 1.6 million square feet or 1.9 million square feet, with 3,300 parking spaces under either scenario.

The company said it would retain and expand three of the four existing buildings, a central utility plant and the existing parking garage.

The company would add five or six new buildings, including a new parking garage.

Expedia said it doesn’t want to change the 65-foot height limit on the property, or the 100-foot view corridor at West Prospect Street where a pedestrian bridge connects the campus to Elliott Avenue West. It also plans to preserve public access that exists along the waterfront.

Real-estate broker Brian Hayden of Flinn Ferguson said it’s smart for Expedia to try to secure as much flexibility as it can for future growth.

If the company builds out the entire footprint it’s seeking, the campus could have more than 12,000 employees there by 2030, he said.

“That corridor is going to drastically change,” Hayden said.

Expedia will begin a master-planning process required by the city for major development on large tracts of land. That will include looking at the impact of the campus’ growth on the environment and traffic, the company said.

To get the master permit, Expedia will need to satisfy city officials that it has the right measures in place to reduce the number of employees commuting alone in a vehicle between 6 a.m. and 9 a.m.

When the company moves to the Seattle campus, it must limit those single-car drivers to 49 percent of commuter trips. At the end of 15 years, it must reduce this to 30 percent, an Expedia spokeswoman said.

Mark Nagle, Expedia’s vice president of global real estate and strategic sourcing, said in a statement that the company will work closely with the city on a new transportation-management program.

Traffic-reduction measures could include “daily financial incentives” to employees who don’t drive alone to work, a shuttle system between the campus and transit hubs, and car-sharing programs, according to documents filed with the city earlier this year.

Expedia selected Seattle-based architecture firm Bohlin Cywinski Jackson to design its waterfront campus.

The firm previously designed Seattle City Hall with Bassetti Architects and tech firm Square’s 100,000-square-foot headquarters in San Francisco.