Something interesting to note here is that North Carolina Railroad claims a 200’ wide corridor across nearly the entire state, with very few exceptions. However, on their website, they do state that “there are areas of the NCRR corridor that are not a uniform 200-feet-wide”, specifically mentioning central Raleigh as one of four towns in the state where this is the case. If you look at the map, this very block seems to be abutting the most constrained part of the NCRR, where the right of way is only 100 feet wide, and by my eye it seems that a corner of this building may even encroach slightly into this right of way.
One can almost be certain that, as this parcel is developed, NCRR will look to protect and expand their corridor. Perhaps they will look to buy or even condemn the back 50’ of this property in order to do this.