The top isn't my favorite, but admittedly, I'm not sure how I would change it if I could. Most modern towers these days are symmetrical, so seeing this one being very asymmetrical does make it a bit strange. I was trying to think of what other towers might be like it and only came up with 30 Hudson Yards in New York, F5 Tower in Seattle, and 181 Fremont in San Francisco.
I could see the design of the tops of 30 Hudson Yards and 181 Fremont being applied to 98 Red River, or even F5 Tower, though, neither of those are exact matches either when trying to think about how to do the top of an asymmetrical tower. I think one thing I would change with 98 Red River's crown is to have the columns in the southwest corner of the crown flipped upside down so that they're /\ shaped instead of \/. That would set up a design at the peak of the roof where you could carry that design up with a spire on the southwest corner of the roof. I'm not crazy about spires, but I don't think it would look bad here. Just look at 181 Fremont to see. 30 Hudson Yards might be a tougher fit for the roof here since you'd have to somehow mesh the crown with the rest of the facade, and 30 Hudson Yards does that well, but having no columns and just a curtain wall like the the rest of the tower's facade might not look right with the brick like facade because you'd have to figure out how to make that strange since the brick pattern would be cut off by the angled roof.
30 Hudson Yards
http://skyscraperpage.com/cities/?buildingID=95171
181 Fremont
http://skyscraperpage.com/cities/?buildingID=67666
F5 Tower
http://skyscraperpage.com/cities/?buildingID=69837