Marcus & Millichap Inc.’s website has more than 2,800 commercial properties for sale. The most expensive is a hotel on the New Jersey side of the Lincoln Tunnel for $50 million. The cheapest: a Memphis apartment building listed at $55,000.

The company’s collection of retail shops, offices and apartments has made it the country’s leader in private client transactions, which generally are below $10 million and make up the bulk of U.S. commercial real estate sales. It’s also made the brokerage’s founder, George Marcus, a billionaire.