heads or tails?

it's been a long time bare - 
camden's white rectangle,
where warhols were wanted,
where funny-looking fellers and
half a pretty girl's face stared across the street
at the seedy massage parlour,
where WE HAD A PROBLEM,
where Lovecraft's punk rested on Fred's bench.
but now the master of the space
has thrown money at the wall

the QR works, but what does it say? answers in the comments box, please