I went to elementary school in that area (St. Philomena's) and still have a lot of ties to the region. That building has been up there for at least a decade now, but I still can't get over how it really stands out like a sore thumb each time I'm crossing the Mount Hope Bridge. Wildly out of character.
I think that it continues to have hard times - it's been plagued by lawsuits, vacancy (google "unsold units carnegie tower"), and battles with the community. The vacancy doesn't surprise me. Between extortionist unit costs - tower units were mostly in the millions Ranging from around $900k to smaller, low level units to over $15m for the penthouse) and ridiculous fees ($75-100k initial club membership, and $1k monthly association fees) - all by 2 of the 79 condos in the tower were unsold 3 years after the tower opened. The vast majority (68) were eventually turned back over to the lender in lieu of foreclosure. Not sure what occupancy is today, but I don't think it's good in spite of massive price cuts and no longer requiring owners to buy into the club membership.
I can't believe they ever though the tower would be a good idea (I think the other homes in the club do fairly well). It's like they tried to draw from two different types of markets and picked all of the worst characteristics of each. "Hey! You know how you'll pay a premium to live in a high-rise in the heart of a city like Boston or New York? And You know how you'd also love to have that oceanfront home with stunning views? Well we've taken the lack of space and privacy of the city, moved it away from all of the amenities you loved, and are charging you as much as/more than single family homes in more desirable waterfront locations!" Don't get me wrong, I'd kill for a condo in the Millennium Tower, and I'd love a home on the waterfront in Newport. But this tower has zero access to the things that make the MT appealing (shopping, dining, jobs, etc.). Even mediocre suburban strip retail is 15 or so minutes away at best. And while the Mt. Hope Bay is beautiful, this spot is kind of a nomans land and is hardly comparable to the waterfront properties closer to the ocean.
What's worse, is that the Carnegie Tower is held up by Providence development opponents to fight any/all condo development in the city. Fane Tower in particular. They say that the Carnegie Tower is proof that luxury condos won't sell in RI. It's unfortunate because anyone on this forum can see that Carnegie Tower is not at all an apples to apples comparison to a downtown Condo development on transit lines, near employment centers, colleges, hospitals, shopping, dining, etc. But the comparison works when it comes to scaring the uninformed/those unwilling to do a little critical thinking.