Quincy Mayor Thomas Koch selected Redgate Real Estate Advisors of Boston to take a fresh look at the city’s $1.6 billion downtown redevelopment project, which ground to a halt last fall.

Six companies had submitted qualifications to become a strategic development advisor to the city and update the redevelopment plan to reflect current market conditions.

“We’re moving forward, and I’m excited to have a firm with Redgate’s experience, talent and passion to work together with us,” Koch said in a statement. “The quality of all the proposals and the interested firms was very impressive, something I believe speaks to a level of confidence the market and the development community continue to have in the progress we’ve made and the direction we’re heading.”

Redgate has provided strategic planning for projects in Kendall Square in Cambridge, the Fan Pier in South Boston and six-acre site at Marina Bay in Quincy recently approved for mixed-use development.

The master plan approved by city officials in 2007 called for 3.5 million square feet of commercial and residential space in the downtown area. The first phase of construction, consisting of 287 apartments, 35,000 square feet of retail shops and 24,000 square feet of office space, began in mid-2013 but stalled in October after costs escalated. Koch removed master developer Street-Works of White Plains, N.Y. in March.

Redgate will be responsible for reviewing the scope of development to reflect current real estate market conditions. It also will recommend the order in which parcels are redeveloped.

The new strategy is expected to result in a new request for proposals from multiple developers for various parcels covering approximately 50 acres.