I think that wherever you found that number may have just made a typo. The number I found on the Downtown Raleigh Alliance downtown living webpage shows 919-823-5350.
Grosvenor Garden :: Downtown Raleigh Alliance
That said, I believe that Grosvenor is all studio apartments, so they might be a bit smaller than you are looking for.
Look around on the Downtown Living map on the Downtown Raleigh Alliance page to find contact info for some of the other apartments located in the vicinity, such as Boylan Apartments, Capital Apartments, etc. I live in that neighborhood and it is a great place to be!