I have no idea what the cost would be for the Holiday Inn. A check of their website or a phone call to their 800 number should get you good info. I believe the street address is Hughey Ave. (Hard to tell as it's on a corner).
NO!! NO!! NO!! Absolutely DO NOT walk from the T. D. Waterhouse to anywhere at that time of night. This is a pretty "bad" section of town (I really dislike that expression but have no other way to express it) and you run a real risk of bing accosted of you walk there before sunup or after sundown. You'll probably be "approached" if you attempted to walk in this area during the day.
The Holiday Inn is quite close so cab fare would be nominal. Since driving is not an option, bring many extra dollars for cab fare. There is a public bus service, Lynx, but the route map is almost impossible to decipher! However, the bus drivers are reportedly very helpful.
Hope this helps a bit. Sorry I don't have more specifics for you.