At 594 Dean site across from project's southeast block, co-working space coming (updated: no post office)

A rendering without the new third floor

I'm late on this 1/7/15 DNAinfo article, Shared Workspace With Pour-Over Coffee and Roof Deck Coming to Brooklyn:

PROSPECT HEIGHTS — Workspace sharing company Industrious is opening its first New York location in Prospect Heights this spring, creating 18,800 square feet of “social office space” across from Atlantic Yards by mid-March, complete with pour-over coffee, a roof deck and "relaxation rooms," its co-founder said.
The company will take three floors at 594 Dean St., between Carlton and Vanderbilt avenues, building out a mix of glass-enclosed private offices and communal working spaces for up to 250 people, said Industrious’ co-founder Jamie Hodari... 

Industrious will move in after the building’s owner, 1121 LLC, finishes a renovation of the former industrial space that includes a new third floor, an updated facade and the build-out of retail space, according to building plans approved by the city this summer. The LLC bought the property for $6 million in 2013, according to records.

This is right across the street from 535 Carlton, a new "100% affordable" tower, which means Industrial is installing “brand new, very intense soundproof windows” to stifle construction noise. I don't think all neighbors have that.

The news first appeared 1/6/15 in Crain's New York Business, Industrious tenant hits Prospect Heights: Co-working space startup leases nearly 20,000 square feet at 594 Dean St.:

A new co-working space provider has inked a lease in Brooklyn. Two-year-old Industrious, which provides shared office space, has signed a 10-year deal for 18,800 square feet at 594 Dean St., between Carlton and Vanderbilt avenues, paying nearly $36 a square foot.
Though Industrious has locations in Chicago and Atlanta, this is the first outpost in New York for the company, which plans to relocate its headquarters from Dumbo to a portion of its new outpost in Prospect Heights when the space opens in March. With room for 60 offices, the Dean Street site should accommodate as many as 250 people, said Jamie Hodari, who co-founded Industrious with childhood friend Justin Stewart. The space will include a speakeasy room, a roof deck and back terraces. Mr. Hodari chose the site for its centralized location.

Asked on Twitter if this is also the site promised for the move of the Atlantic Avenue post office in Boerum Hill, DNAinfo's Rachel Holliday Smith said yes. Indeed, that news was reported last August.

However, Rob Perris, District Manager of Community Board 2, writes:

The USPS discovered belatedly that the proposed location isn’t in 11217. The postal service has now announced that the station will move to 290 Flatbush Avenue, previously a Chase bank branch.