I lived in the Colonnade 10+ years ago. Things may have changed so take this with a grain of salt.

The apartment floorplans are pretty nice Very spacious. I have to say I absolutely loved the massive glass windows (was in a corner 3BR).

The corridors and elevators are dingy and outdated - don't let the light, bright, modern lobby fool you. They'll also inevitably only ever show you one of their "showroom apartments" where everything is tiptop condition - what you'll get will not be as nice.

Management was dreadful when I was there, maintenance was slow/nonexistent. We also had issues with roaches coming up through a massive hole under the sink that I imagine was just a building cavity for plumbing. Out apartment could be absolutely spotless and we'd still see them. Eventually when management refused to do anything we just filled the hole with spray foam insulation which kind of solved the problem.

We also ended up with bedbugs (it was apparently very prevalent in the building at the time, so not just us as an isolated incident) and the building did absolutely nothing about it - we had to hire a company on our own dime, and it was impossibly difficult to shake them because they were all around the building. This was psychological torture - if you've ever dealt with bed bugs, you know.

The immediate area isn't particularly great either, nothing of value really within walking distance. Someone tried to rob me outside the lobby one night, and both mine (in the lot) and a friend's car (on the street) were broken into.

There was a little bodega type store and laundry facilities in the basement - both pretty meh but better than nothing I guess.

It's a shame, because the building has great bones and deserves better. If you're an architecture nerd - it's a Mies van der Rohe building (along with the Pavilion buildings). There's a great picture hanging in one of the leasing offices of Van der Rohe's vision for the city of Newark, and it included tons of high rises in the same style.

Again, unsure if it's changed at all since then so take with a grain of salt