Do a Manhattan office space valuation with real numbers, on my old work building

Do a Manhattan office space valuation with real numbers, on my old work building. An old Goldman Sachs Trading building at ONE NEW YORK PLAZA in downtown Manhattan. Do all of your work in Excel.
Using google to do a search, what range are Manhattan office space cap rates in over the period from 2022-now? Cite your sources for your research. Note the rates might be scewed by the effects of covid, that is OK.
Using a google to do a search, what range are Manhattan office space rental rates per square foot over the period from 2022-now? Cite your sources for your research
I used to work at ONE NEW YORK PLAZA in Manhattan. Using google to do a search, how many square feet of space does my old job building have? Assume it cost $28 a square foot after taxes to manage and maintain NYC office space these days (I google searched this number). Using the income approach, how much is the 85 Broad property worth these days? Explain your numbers and show all your calculations in Excel.
Clues:
-Find out what net operating income (NOI) per square foot is. Rent-costs＝NOI. Then multiple NOI by number of square feet to get total NOI for the whole building.
-Then to find out the value of the property, use the cap rate and the annual (not monthly) NOI.