It looks like it would fit next to the former Shilo - Sorry I hate typing out Holiday Inn for a downtown hotel.
The west face (right side) also seems to match the design of the image in the RDA report about selling the land from the city to the developer.
If PEG owns the Holiday Inn, then it is a good guess that this is the Marriott hotel that will be going on the surface parking there.
The height also seems to be around the 100' mark - the cap for mid-block buildings without a conditional use permit.
Lastly, I did check and AC Hotels is a Marriott brand...
https://hotel-development.marriott.com/brands/ac-hotels/