It sounds like you have a great piece of land for your new build! The fact that it is already equipped with a new well and a new 3-bedroom septic system is a big plus, as these are essential components for any new home. The gravel driveway and drainage are also important for ensuring proper water management around the property. Being located in a private gated community is another positive feature, as it can provide added security and exclusivity. And the fact that your land is situated in the upper part of the community, with little traffic and a quiet, serene atmosphere, is definitely a bonus. The new outbuilding will be remaining on the property. It's also worth noting that the road ending in a cul-de-sac beyond your property can help limit traffic even further and add to the overall peacefulness of the area. All in all, it sounds like you have a great opportunity to build your dream home in a beautiful, private, and tranquil setting. Good luck with your new build!