I need 4 pages of Cost-Benefit Analysis with two outside references!!

My part should include estimated green roof installation cost of MLK library at San Jose Downtown. I couldn’t get exact size for the roof so it would be fine just with cost of per square ft or square meter.

My conclusion should be even though first costs of accessible green roof range from three to six times the cost of a typical roofing system, in the long term, green roofs may be less expensive and outperform conventional roofing.

You can use other outside reference if the ones I upload doesn’t seem right.

Thank you.