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Dominion Resources will start tearing down a six-story office building next to its downtown headquarters today to make room for a 20-story tower that will be among the tallest in the Richmond skyline.

One lane of Seventh Street between Canal and Cary streets will close at 6 p.m. Friday. At 6:30, when demolition is set to begin, all lanes on that block of Seventh Street will close and one lane of East Cary Street between Sixth and Seventh streets will close. Dominion spokesman Ryan Frazier said the lanes should reopen soon after 5 p.m. Sunday, but no later than 5 a.m. Monday.

The demolition is expected to take about four months, and the new tower is scheduled to be finished by the beginning of 2019. It will become home to about 1,300 of the Richmond-based utility’s employees, which is about the same number who work in One James River Plaza next door.

This weekend, crews will use heavy machinery to destroy the parking deck on the corner of the Richmond Plaza building at 111 S. Sixth St.

“At the end of this weekend, the parking structure should be gone,” Frazier said. “That will enable us to get the heavy equipment in so we can start doing the exterior and interior demolition with the wrecking ball.”