The southern portion of Morningside Park has been closed to the public for the last six days.
During his 16 months in office, de Blasio has traveled frequently outside of New York state.
The mayor met with other municipal leaders hours after an Amtrak derailment killed 7 people.
Groups are calling for a rezoning process that includes affordable housing and union jobs.
The centers — three in Jamaica and one in Kew Gardens — will provide 270 new pre-K seats.
The mayor is traveling the country to spread the word about his "Progressive Agenda."
A Diversion Center where officers can take low-level offenders will open in Harlem this fall.
Mayor de Blasio hopes to spur affordable housing through a mansion tax and reform of 421a tax benefits.
The mayor said his $78.3 billion budget prepared the city for future downturns.
Speaking on "Morning Joe," de Blasio said the tone of his relationship with police was "much better."
Brooklyn Councilman Brad Lander called the legislation the "toughest" protections in the country.
Union response to de Blasio softens as city mourns shooting death of officer Brian Moore, 25.
The site opened in January in response to this winter's frigid temperatures.
The gun was stolen with 23 other weapons from a bait and tackle shop in Perry, Georgia, police said.
NYPD officer Brian Moore was shot in the head by Demetrius Blackwell, officials said.
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