Can I add a separate income stream in the appraisal without calculating the gross or net sale value of the property?

You may add an income group and the income can be anything from rental income during the development phase, to the sale of a freehold or the sale of additional revenue sources such as parking - anything that isn't a sale of a unit can be factored into the Income group.

In addition, you may add an operated asset group and input the weekly/monthly/annual rent that would be generated by the property. Then, enter 100% as the yield so that the gross or net revenue would become the annual gross or net income but not the sale value of the property.

Using this method, you can create an income stream group for each year and edit the inputs even more granularly.