Orton Development’s 280K SF Historic Pier 70 is now fully leased. Gusto, an employee benefits company, just finalized a 10-year lease for 50K SF at the property, the San Francisco Business Times reports. Gusto will be moving from its South of Market office at 500 Third St. into the new office at 113 20th St. next summer. The company’s new lease is about double its current lease in SoMa. Gusto expects to increase its San Francisco workforce to over 400 employees within the next few years.