QB Issue Resolution:

no there is not a way to use class without the upgrade

if you have no vendors, then I assume you own the rentals

if you create the customer as the property address and then create the tenant as a sub customer, rental income can be tracked by sub customer easily

repairs and maintenance though are really what the class would track, sub accounts per expense named for the address would work, though it makes the account listing long if you have many properties

Resolution for Issue 'Class list with out upgrading to the PLUS?' available: Yes (Solved).
Source: Intuit Community forum.

Class list with out upgrading to the PLUS?: 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.

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