In 1971 Mark Zoller was the owner and General Contractor of Zoller Construction in Vancouver, Washington. Less than two years later he was also a Licensed Real Estate Agent and he began operating the two businesses simultaneously. He continued to operate both businesses until 1982 when he put all his energies into Real Estate.

In 1984 he obtained his broker's license and began doing business as the M. H. Zoller Co. He spent much of his time in Commercial Real Estate, but was also doing some business as a commercial/residential appraiser and in Real Estate development.

M. H. Zoller Co. was a one man office until 1994 when Mark's son, Chad Zoller, began working out of the office as a Licensed Real Estate Agent, and from there it quickly became a family business. Mark's daughter Angela and her Husband David both work for the company, Angela is the bookkeeper while David is the construction foreman. Another daughter, Megan, maintains the day to day business affairs of the company, and also covers as the receptionist.

In 1995 the M. H. Zoller Co. jumped back into the developing and construction field, and has completed or is involved in several different developments totalling over 300 houses, townhouses, and condos in Clark County, Cowlitz County, Cathlamet Washington, and Boardman Oregon. Most of the construction is currently done through Crown Equities which is the construction branch of the M.H. Zoller Co., LLC with David Gohl as the foreman.