In the 1970s, Standard Insurance Company developed a large tract of land along the Sunset Highway near 185th Avenue.

[3] In 1983, the county approved a master plan created by Standard to develop 850 acres (340 ha) at Tanasbourne.

[6] The Streets of Tanasbourne lifestyle shopping mall opened along Cornell Road in October 2004 after original approval for the project in 2000.

[9] In 1974, construction began on a $6 million shopping mall to be named Tanasbourne Town Center, located on the east side of Northwest 185th adjacent to the Sunset Highway.

The original tenants included a library, a day care, professional offices[2] and a three-screen movie theater named Town Center Cinemas.

[23][24] Besides shopping centers, Tanasbourne is home to large apartment complexes, industrial/commercial parks, numerous hotels, and many medical facilities.

[25] Located in Oregon's Silicon Forest, the area is home to Epson's Portland operation, a large Tokyo Electron office, the headquarters for Virginia Garcia Memorial Health Center, a complex housing offices for Standard Insurance Company, and OHSU's West Campus.