The redevelopment of the World Trade Center is likely the most arduous, complex, drawn-out megaproject in the city. Rebuilding the tragic site has been fraught with everything from funding troubles (3 WTC), architect switches (2 WTC), and perennial delays (Santiago Calatrava's skeletal winged transportation hub). But 13.5 years after 9/11, the symbolic 1,776-foot-tall 1 World Trade Center, 4 World Trade Center, 7 World Trade Center, and the 9/11 memorial and museum are all open. Status report: 3 World Trade Center has started rising again, 2 World Trade Center is in tenant talks; the park at the complex's southern end with a small church is under construction. One World Observatory atop 1WTC is opening in May, and Calatrava's $4 billion PATH station is also set to get operational this year. The performing arts center is still looking for an architect, and funding, but we can't win 'em all, can we? [Image via World Trade Center Progress]

Riverside Center is an eight-acre development rising on an old industrial lot and exposed railyard between 59th and 61st streets on the west side waterfront. The whole five-tower project, conceived by developer Extell along with Dermot Campany, has been pocked by uncertainty from the get-go, with original master planner Christian de Portzamparc eventually being swapped out for individual building developers. Two of the project's five towers are under construction, including Silverstein and Elad's noted "poor door building," and SLCE's 43-story, 616-rental building at 21 West End Avenue.

This 28-acre megadevelopment is the product of a 2005 rezoning that paved the way for Special Hudson Yards District. Ten years later, the 33 projects that will comprise the new neighborhood are finally beginning to rise. The megaproject is a collaboration between a slew of developers including Related, Moinian Group, and Tishman Speyer, with towers designed by the likes of the project's master planners, Kohn Pedersen Fox, as well as David Childs of SOM, FXFOWLE, BKSK, and Diller Scofidio + Renfro with David Rockwell, to name a few. When complete, Hudson Yards will stretch between 30th and 41st streets and Tenth and Eleventh avenues, and be comprised of a mix of residential, office space, retail, and community space. It will also be served by a functioning 7 train extension—fingers crossed.

The Seward Park Urban Renewal Area's Moses-era legacy of failure will finally be left behind with Essex Crossing. The 1.65 million-square-foot project will rise on the largest swath of undeveloped land south of 96th Street, and will include 1,000 apartments in buildings designed by SHoP, Handel, Beyer Blinder Belle, and Dattner. The development will also include a Regal movie theater, a new and improved Essex Street Market, a bowling alley, and a cultural space that will no longer be occupied by the Andy Warhol Museum (sad face). Despite its increased density, the development will include no parking.

Ivy league university Cornell is bringing a glassy, sustainable, public-space-prioritizing tech campus to a southern portion of Roosevelt Island. The multi-use development will cover 2 million square feet and include academic and residential buildings, a hotel, and a "tech walk," or central campus. Although it sounds like a good excuse to visit the curious island, that trip will have to wait: the whole project won't be complete for 20 years.

After a decade of delays, a giant municipal parking lot at the corner of 39th Avenue and 138th Street is finally giving rise to Flushing Commons. The 1.8 million-square-foot megaproject will bring 600 apartments, a YMCA, a 1,000-space underground parking garage, 1.5 acres of open space, and 350,000-square-feet of commercial space to the area. The first phase broke ground in July of 2014, and the whole shebang is expected to be complete by 2020.

The 1,723-apartment development on the Astoria waterfront got the green light from the city in November after a lot of back and forth regarding its affordable housing component and use of unionized labor (there will be 460 affordable apartments and all labor will be unionized). Other than housing, the mixed-use development will have a ferry dock, a grocery store and a public school. Alma Realty is developing.

A 30-acre swath of Long Island City waterfront is giving way to Hunters Point South, a mixed-use development with a focus on affordable housing; the largest such development to be built in the city since the 1970s. Of the 5,000 units included in the 20-project development, well over half will be priced below market rate. The development will bring a school, retail, restaurants, and a waterfront park to the long-desolate area.

Greenpoint's 22-acre redevelopment project will transform the industrial north Brooklyn waterfront into...something else. The megaproject will stretch between Green and Box streets, and will be comprised of 10 buildings containing a whopping 5,000 apartments (1,400 of which will be priced below market rate), a 640-seat elementary school, retail space, and a resilient waterfront park. Construction started in July, but the project as a whole isn't expected to be complete for another 8 to 10 years.

Bushwick's former Rheingold Brewery site—bounded by Bushwick and Evergreen avenues and Flushing Avenue and Melrose Street—is being cleared to make way for a 10-building project. The redevelopment of the 6.4-acre site is being steered by Read Property Group, and will bring nearly 1,000 rentals (300 will be affordably-priced), shopping, and a 17,000-square-foot green space to the area. The first of the project's developments will break ground this summer.

To the northeast of Pacific Park is Downtown Brooklyn's City Point, the mixed-use development rising around Flatbush Avenue Extension and Fulton Street that replaces the unsightly Albee Square Mall and parking garage. The development—the brainchild of Acadia Realty Trust—will include a retail component with rumored tenants like an Alamo Drafthouse Cinema and CityTarget, and at least 700 apartments spread over three buildings. The first of City Point's residential towers have already topped out, and pave the way for Extell to begin their residential tower, which may become Brooklyn's tallest.

The megaproject formerly known as Atlantic Yards has already partly come to fruition with the opening of Barclay's Center, but much of the 22-acre development is still underway. Included in the Frank Gehry-designed master plan are 16 additional buildings bringing 6,430 new apartments (2,250 of which will be priced below market rate) to Prospect Heights. Developer Greenland Forest City Ratner has tapped firms like COOKFOX and SHoP to design the megaproject's residential buildings. In addition to the arena and apartments, Pacific Park will bring commercial and retail space and an eight-acre park to the area. Greenland Forest City Ratner expects the massive development will be complete by 2025, which means area residents better brace for some seriously long-winded construction unpleasantries.

Industry City will undergo a $1 billion revamp at the behest of developers Jamestown Properties, Belvedere Capital, and Angelo Gordon that will bring a hotel, retail and tons of space for tech startups to the 16-building hub. The redevelopment won't include housing.

The northern tip of Staten Island in St. George is poised for change; change in the form of one really giant observation wheel and a bunch of outlet stores. The Staten Island Observation Wheel will be the tallest in the world at 630 feet—that is, only until it's surpassed by Dubai's planned 690-foot wheel. Alongside the wheel will rise Empire Outlets, a 125-store complex that broke ground last month.