Greylock Partners is uprooting its headquarters after 44 years in Boston to move to venture capital’s west coast mecca on Sand Hill Road in Menlo Park, Calif. While the firm has been actively involved in Silicon Valley and the tech startup scene for years, leadership decided it was time to make a bigger commitment.

As part of the shift, Greylock is adding several new positions, including partners. It’s currently cooling its heels in an office in San Mateo while it waits for its Sand Hill residence to be built. It will keep a leaner operation in Boston where it has significant investments.

The firm’s portfolio includes several big names like Digg, Facebook, LinkedIn and Zipcar.