It can be surprisingly effective and cost effective too. By keeping repairs due to damage down the amoutns needed to eb passed onto householders can be minimised. Further, central govt grants can be accessed to pay fro much of the cost.
The Milton Court was really transformed, burglary rates dived including atrifice invasions on the old, lots of crack and smack dealers moved out as their activities were too noticable with troops of users going past the concierge to get their gear. People stopped pissing and shitting in the lift.
The cost of a three man staff team (to cover shifts) plus a bullett proof box for them to sit in is affordable I would argue.
In fact, if needed I will do the finacial assumptions spreadhseet for anyone wanting to lobby the council.
Ph and house insurance became affordable post concierge too.