QB Issue Resolution:

A mortgage payment is composed of at least two, and up to four different amounts

the principal part pays down the loan and is not an expense
the interest paid for that month is an expense

if you have insurance as part of the payment then that posts to an insurance pre-paid asset account
if you have property taxes as part of the payment then that posts to a property taxes pre-paid asset account

Resolution for Issue 'For expenses: under what category is the mortgage payment of an office building go under?' available: Yes (Solved).
Source: Intuit Community forum.

For expenses: under what category is the mortgage payment of an office building go under?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for expenses
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Error Recovery for expenses [Canada]
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