Centro Properties Group and its related trusts may be the next to face up to their dim prospects, with the appointment of administrators (by directors) and receivers (by multiple banking syndicates) looking increasingly likely.The decision this week by banks to push Allco Finance Group into administration is generating talk of a harder stance by banking groups toward their most troubled and prominent credits. The theme common to Centro and Allco - other than being very much under informal, bank-supervised administration since early this year - appears to be a loss of patience by the banks over the reluctance of directors to sell assets.ABC Learning Centres is also reported by national newspapers to be on borrowed time with its bankers, though in its case it may have a supportive shareholder (Singapore's Temasek) and there are the thorny issues of federal government subsidies for politically sensitive child care centres to manage.In the case of Allco Finance Group, for which Ferrier Hodgson is receiver, there are offers, even if low from the point of view of the directors, for the aviation business. The Financial Review reported an offer from the LCJB Investment Group, an investor owned by members of the Liberman family, for this business.The Sydney Morning Herald reported that Allco endeavoured to sell its aviation and shipping business last week to the banks.Another factor informing bank attitudes may be reducing costs at troubled clients. In theory the core corporate costs of running a company will be lower where the assets are under the control of receivers and administrators than when they are formally under the control of executives and directors recruited at boom-time rates of pay.The push of these troubled firms- whose credit stress has been obvious for 10 or 11 months - into administration may force banks to review their timid provisions for these and other firms.Commonwealth Bank appears to have at least $1.2 billion, and some reports suggest as much as $1.4 billion, in exposure to Centro, with two thirds of that unsecured. The quality of CBA's, and some other banks', security over Centro assets may also be dubious given competing claims over assets below the holding company.CBA may also have the highest exposure to ABC Learning, with about $280 million through its own direct lending and another $75 million once it finalises the purchase of BankWest.Meanwhile Westpac yesterday said its exposure to Allco Finance Group was approximately $200 million, double the level of some widely circulated lists.