Veteran Manhattan agent Richard Steinberg is joining Compass. He resigned from rival brokerage Douglass Elliman on Wednesday and will work out of Compass’ office at 851 Madison Avenue. Steinberg’s three team members — Alexander Mignogna, Emanuel Fiore and Carli Levitt — are moving with him. “We just felt for our personal growth that we wanted to try something slightly different,” said Steinberg in an interview. Their bank accounts might also grow: Compass has recruited agents