What Would You Change?

A little different addition here to this cir. 1860 home in Maryland. At a cool 3.9 mil you can buy and have a modern crows nest on your farm house. Question, what is in it?

https://www.zillow.com/homedetails/10420-Oaklyn-Dr-Rockville-MD-20854/37269620_zpid/

As far as what I would change? Perhaps the addition to look more like a silo on a farm? I would also photograph what is in it!