The thing that separates the DeVos house from the other mansions is the Helipad and the private hanger. This is the only private residence in the area that has these and DeVos has the first permit issued from the township to be able fly in and out. They also just finished building another home off Lake Macatawa in Holland however the maps aren't completely updated. But nice finds on the other mansions.
The house on Steketee Ave belongs to Daniel DeVos, brother of Dick. The large addition on Dick DeVos' house is an indoor Tennis/Gym facility not a hanger. Their Helipad is across the street.
In Ada,MI there are 2 much better and larger mansions:
1)Steketee Ave NE, Ada, MI 49301
2)1780 Old Woods Ct NE, Ada, MI
These 2 mansions must be owned by businessmen who are involved in Amway.
1) Steketee Ave NE, Ada, MI 49301 - http://www.bing.com/maps/default.aspx?v=2&cp=42.97755683284957~-85.54905384778978&sty=a&lvl=18
2) 1780 Old Woods Ct NE, Ada, MI - http://www.bing.com/maps/default.aspx?v=2&cp=42.99457206284087~-85.55420368909837&sty=a&lvl=18
Check out this several hundred acre estate. Belongs to Steven VanAndel, Chairman of Amway Corp.
http://www.bing.com/maps/default.aspx?where1=1525+HONEY+CREEK+AVE+NE+ADA+MI+49301