Walsh Door & Security, one of Des Moines’ oldest family-owned companies, has acquired Metal Doors & Frame Co. in Kansas City, Mo. The transaction, which closed on Dec. 31, adds 12 employees and expands the company into the Kansas City market. Terms of the deal between the two family-owned businesses were not disclosed. “We believe expanding into the Kansas City market with a physical presence will allow us to better serve our existing customers, gain additional customers and further grow our door, hardware and electronic security business,” said Marty Walsh IV, a fifth-generation owner. The 153-year-old company, which now has more than 100 employees, expanded to Iowa City in 2001. Walsh plans to expand the Kansas City location, which will operate under the same name in the near term and will transition to Walsh Door & Security over time.