Fuck it. Let's do it illegally then.
I'd love to, but it would be a waste of time if we're just going to get reported.
But we'd have fun doing it, right? I'll volunteer to stand by while the artists are working and smash any cellphones or cameras that come near it! 
Oh, this sounds like fun. Count me in.
You know... I sense a business opportunity for the two of us.
I bet Catlanta would paint a mural there illegally for you...
Heh, right?
But in all seriousness, where's the line? Very few landlords are keeping their properties clean of tags, individual people can only do so much before burnout sets in, and if we decide we want to go forward with an illegal mural, who gets to decide what is "acceptable" public "art"?
excuse me while I slip and slide down this slope...