Mahogany wood used to cover the exterior of a single family home?

I am an appraiser working in San Diego. I am seeing mahogany wood used extensively in the building of high quality single family homes. In particular, I am looking at a home approx. 5000 square feet. The exterior is totally covered in mahogany with the interior also utilizing mahogany trim. Does anyone have some idea of the cost it takes for this type of construction using mahogany? Thank you!