However, I accept that the defendant/mortgagee does reasonably anticipate proceedings in the nature of accounts, for which it will be entitled to costs unless it has been guilty of misconduct, and in relation to which it could be reasonable for it to retain security out of which to satisfy those costs. However, I do not think it is reasonable for the defendant not to attempt to give an estimate as to what these costs would be; if it were, it would mean that a mortgagee who was asked for a payout figure, and then told that it would be paid under protest, could refuse altogether to give a discharge of the mortgage otherwise than at the conclusion of redemption proceedings, after full accounts had been taken. I think that such a view was against the approach of the Privy Council in Bank of New South Wales v O'Connor ...
It may be reasonable for a mortgagee to specify a very generous estimate of its anticipated costs: the Privy Council referred to 'a proper margin'. Indeed, it may be appropriate to have regard to a 'law' which I think deserves to be as well known as Parkinson's law (which has various versions such as 'work expense to fill the available time'). I refer to Hofstadter's law, which appears at page 152 of Godel, Escher, Bach by Douglas Hofstadter, and which is as follows: 'It always takes longer than you expect, even when you take into account Hofstadter's law'. The relevant version of this law, which I call Hofstadter's law (costs version) is: 'It always costs more than you expect, even when you take into account Hofstadter's law (costs version)'.
If the defendant in this case had given evidence to justify retention of well in excess of $20,000, showing some basis for this, I may well have considered that it should be permitted to do so: this would have been at the defendant's risk, of course, in that its conduct in retaining such a sum might ultimately be judged unreasonable. However, in the absence of evidence from the defendant, I have to do the best I can on the basis of the evidence led by the plaintiff to decide what would be, in the words of the Privy Council in Bank of New South Wales v O'Connor, 'the probable costs of the suit' together with a 'proper margin'. There could be appeals from the taxing officer, so that I would not regard $4,500 as sufficient. On the whole, I think $20,000 would be a generous estimate of the costs which the defendant might incur, allowing ample margin for error. I am not, of course, deciding that it is reasonable for the defendant to retain that amount: questions of reasonableness and misconduct can only be decided when accounts have been taken.
For those reasons, I would order the return of the proceeds of sale, apart from a sum of $20,000. That sum can be retained as security by the defendant, and should be put into some appropriate interest-bearing account.