Silicon Labs - Level 5 Lab & Workplace

Silicon Labs - Level 5 Lab & Workplace is a renovation project located at 400 West Cesar Chavez, Level 5, in Austin's Warehouse District. The owner of record, Silicon Laboratories INC., is undertaking a commercial tenant improvement that spans 20,521 sq ft. The scope includes demolition and the construction of non-structural partitions, ceilings, and finishes, specifically to create an electronics lab and associated workplace areas with necessary mechanical, electrical, and plumbing upgrades.

The project carries an estimated cost of $6,500,000, resulting in a cost of $317 per square foot. This figure is above the Travis County median of $103 per square foot for similar renovation and alteration filings. The scheduled construction window of 175 days is longer than the county median of 98 days. Interior Architects is the design firm of record, a firm with six other TDLR-registered projects totaling over $44 million in recent filings.

Construction was scheduled to begin in November 2025 with a completion date of May 2026. However, the TDLR status remains Review Complete, and the agency has not yet recorded a final inspection. Therefore, the current state of the site is not confirmed in the public record. Mark S Robinson is the registered accessibility specialist listed in the filing, and the project is privately funded on private land.

City of Austin permit records show 18 permits on file at this street address between July 2025 and August 2026. These include eight electrical permits, five building permits, two plumbing permits, and two mechanical permits. Recent permit descriptions reference signage for the building's south, west, and north elevations, as well as the addition of radio frequency chambers to the lab.

The surrounding Warehouse District neighborhood has seen other renovation and alteration projects, including work at West Austin Park and 501 Congress. The ZIP code 78701 has a median household income of $154,867 and a median owner-occupied home value of $653,600, according to U.S. Census estimates. Travis County's unemployment rate was 3.9 percent in July 2026. This project represents a significant investment in the local commercial real estate sector, focusing on high-tech laboratory infrastructure within an established urban district.