Brookfield Properties completed a 120,000-square-foot concrete platform on the West Side.
The long-vacant P.S. 186 on West 145th Street will become a Boys and Girls Club and affordable housing.
A temporary fence will close off the eastern portion of the park while repairs are being made.
The DOT repairs, which have not been widely publicized, will close the 125th St. exit for three years.
When completed, the elevated triangular park will provide 10,000 square feet of public space.
Dozens of residents voiced their concerns about a redevelopment plan for the library Monday night.
The Department of Buildings issued a stop-work order at 329 Pleasant Ave.
762 homes have started construction and 1,090 people have gotten checks since Sandy, the mayor said.
"When Women Pursue Justice," a mural featuring female leaders, is set for demolition in coming months.
There are more than a dozen major construction projects underway or planned for the area.
1000 Dean Street is among dozens of sites that will open to the public through Open House New York.
A proposed $2.4 million "comfort station" would take away too much greenery from the park, locals said.
Residents point to HAP Investment's construction record as cause for concern.
Demolition will start soon on six buildings at Fourth Avenue and Baltic Street.
Burglaries have jumped 39 percent, partly driven by thefts of new appliances and tools, police say.
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