More than 60 people turned out for a look at the proposed Ashland Mill mega-project during an open house Wednesday night at the Historic Ashland Armory. Planned on the former Croman Mill site on 60-plus acres of the city’s southeast side, what’s now known as the Ashland Mill project represents the largest development proposal in the city’s history, with more than 550 housing units and 200,000 square feet of retail and commercial spaces, as well as pathways, small parks and open spaces.