IRS Publication 17 indicates that cash basis taxpayers (most individuals) can only deduct real estate taxes actually paid during the calendar year. Additionally, when describing escrow arrangements (as with mortgage companies and to some extent, the arrangement we have with DVMC), the publication points out that only those taxes actually paid by the escrow agent (third-party) can be deducted (Form 1098 issued by mortgage companies usually reflects this amount - I'm not sure if 1098's issued by
DVC reflect this information since the finance arm does not actually escrow the funds, the management company does).
Additionally, and as far as I know, DVC does not disclose the exact amount of the tax payment made for each member, but includes a true up adjustment in January of each year for the prior tax year.
For 2006, I would think the method that would most approximate real estate taxes paid for the year would be the 2005 estimate to actual adjustment made in January 2006 and all estimated 2006 taxes paid with 2006 dues.
Of course, this is not be construed as tax advice and you are advised to discuss this issue with your personal tax advisor.