Discount for high vacancy in apartment appraisal?

[Zephyr999]

i do only residential, but what do you do here?
The Salesforce Tower dominates the San Francisco skyline. Nearly 1,000 feet tall, it claims a prominent position in the center of the city. But the imposing missile-shaped building — which is lit up at the top — has a problem: it’s practically empty.

Forecast a lease up scenario...adjust stabilized value concluded in each approach to account for cost and time to derive an 'as-is' estimate.

Reconcile the 2 approaches used as usual. Likely place more weight on income approach with support from sales comparison because sale comps harder to find substitute properties.