The term “Resources for sale” refers to resources (Apartments) that can be purchased or rented monthly, well beyond the duration of a normal holiday.
How to access the resources for sale menu and create a new one:

Make sure your subscription belongs to the “Agency” category

Make sure that your subscription or account has “Enable product placement” enabled in the “for sale” tab (Settings -> Merchant details -> settings -> for sale)

Resources -> Resources For Sale -> + New

The customization page for a new asset for sale will be as follows:

Select the type of contract for the resource, whether Sale or Rent

Complete the textual and geographical fields relating to the resource you are inserting