Two Tesla executives just filed documents with the federal government announcing their intention to launch a new stealth company that’s focused on... well, we’re not exactly sure yet.

Last night, CB Insights spotted a new SEC filing for a company called Redwood Materials. The documents list Jeffrey “JB” Straubel, Tesla’s co-founder and current CTO, and Andrew Stevenson, Tesla’s head of special projects, as its chief executives. The company is housed in a nondescript office building in Redwood City, California, that also includes a law office, a career counseling service, and something called The Wise Mind Institute. The SEC filing also discloses a $2 million investment in the company from an undisclosed investor last month.