The developer was Austin Hamilton. The last I heard he was forced to flee the country because of tax issues, but I don't have any confirmation of that. I haven't seen him in a few years so maybe its true
Now, as for suing a developer, good luck. Each developer creates a corporation specific to each building they construction and once the developer completes the job the company is reduced to shell status. There is nothing to get this far into the future.
What I don't understand is why did the strata even approach the City about replacing it with a painted mural. The City has very little power to force anyone to repair their building. Just look at Trixie Kramer with the Janion and Northern Junk