BerryGerry - I think the 35 mil that looks like it has disappeared is actually still there. It isn't that the WTS has hidden it - the CRA has changed their forms and reporting for the 2014 tax year.
On the long financial form, gifts to qualified donees used to be reported with "other income" on line 4920. This year, the gifts are added on after the expenditures have been totalled. On line 5050 - $35,921,399 is listed as charitable gifts - the 434 congregations that were gifted by the WTS would be in this number and would make up the difference that you see on the brief summary.
The summary in the OP gives the figure of $82,779,949 for total expenditures yet the long form gives the figure of $118,701,348 as total expenditures after the gifts have been added in.
It is possible that the mortgage forgiveness was a move to get in line with the tax laws for charitable organizations. It appears like there has been a change in the CRA rules and reporting.