PS 150, which for a couple decades was embedded at Independence Plaza at Jay Street, will open tomorrow — the first day for public schools — in its shiny new space at 28-42 Trinity Place and Edgar Street. It is also now formally called the Trinity Place Learning Center.

The new facility, designed by Dattner Architects who did the Sanitation garage at Spring, the BPC Parks Conservancy facility, and dozens of other parks and schools in the city, is a vertical one, spanning eight floors. The student body will eventually double in size, but that will be gradual. They are adding a kindergarten and a 3K this year to their usual program, which is one class per grade. Each year the grade size will grow to two classes per grade.

Laura Cohen, the school’s parent coordinator, was very generous to give me a tour when it is clearly all-hands-on-deck getting ready down there: the staff was only allowed into the building on August 29. And every single thing had to be unpacked and arranged: all the equipment and furniture is brand new, since they had double the order with this new building.

They will miss their plaza at IPN (there are two outdoor spaces that are built into the building), but nearly everything else is an upgrade: the school for the first time has a lunchroom, an auditorium and gym combined, a multi-purpose room and dedicated spaces for the nurse, counselors, therapists and the library. They even have a faculty room, a PTA room on the ground floor (all the other offices are on 2) and the classrooms are large and have amenities like interior bathrooms for the younger grades and handwashing stations for the art and science rooms. The tech also looks tricked out.

“We never had any of this before,” said Laura. “Every room we had was doing double duty.”

There will be some adjustments as a result — kind of like a family living in a railroad apartment and moving to a townhouse. “The whole environment is so different,” said Nico Victorino, the school’s principal who came on last year. “We were used to being in a small space, so there will be some growing pains.”

(Another exciting addition: Nico just welcomed his first child, a girl, Lea, now 6 months old.)

The school is opening with 200 kids in this arrangement: one 3K class (the only one downtown in a real school); one Pre-K; two kindergartens; and one class in every other grade. Each year from now on will have two kindergarten classrooms so that the school ends up with a total enrollment of 400-450 and two to three classes per grade.

It’s hard to get a handle on the space, since it’s on eight floors and the entrance is still shrouded in scaffolding while the residential building above, 77 Greenwich, is completed. But the narrow floorplate allows for a central hallway and a lot of windows in each classroom, all with classic urban views. And three floors on the southern half of the school is in the historic Dickey building, whose barrel-shaped rear wall makes for a cool nook in those classrooms.