TROY – The fifth attempt to redevelop 1 Monument Square turned the development process upside down Tuesday night with developers meeting with about 125 residents and business owners to introduce themselves and give some insight into what they plan for the site.

An esplanade along the Hudson River, a public plaza and a grand staircase linking that plaza to Riverfront Park are envisioned as part of the plans for the 1.2-acre riverfront site, the three principals of Hoboken Brownstone Co. said.

The trio didn’t have details but said they intend to get the site developed by learning from the four failed proposals that failed and notes from last year’s public planning sessions.

“We want to get it done,” said George Vallone of Hoboken Brownstone, before the meeting started.

Mayor Patrick Madden said the meet-and-greet session was a chance for the community to hear from and meet representatives from Hobocken Brownstone. In the past, developers proceeded with their plans and only heard from the public when significant opposition arose during the Planning Commission review process.

Sam Judge, whose Judge Development Co. owns the River Street buildings on the north and south sides of the former City Hall site, said Hoboken Brownstone representatives met with him for general discussions.

“They’re getting the lay of the land,” Judge said.

Daniel Gans of Hoboken Brownstone said the company plans to have its development reflect the surrounding buildings in an effort to “echo the history of the neighborhoods.”

When the city selected the New Jersey-based firm as the preferred developer, company officials said they envision investing at least $30 million to redevelop 1 Monument Square with a mixed-use project of retail, apartments and offices. The site has been vacant since the former City Hall was razed in 2011 for a redevelopment effort.

Sumeet Gupta of Hoboken Brownstone said the city has energy and vibrancy, untapped waterfront potential, a creative economy and support across the spectrum from city officials, stakeholders and the public to get the site developed.

When the company was selected, Gupta said the plan envisioned small stores lining the River Street side of the 1.2-acre site, at least 75 apartments, a parking garage, public space, access from River Street to Riverfront Park and offices that may include co-working spaces, hi-tech firms and gaming companies.