The 1983 contemporary hexagon-shaped dollhouse kit by Rundquist Miniatures called The Summer House is on eBay. This 1:12 kit is new in box and features spiral stairs, closets and balconies. It's a lovely design (even better than the coveted Garden House) and very hard to find. Bidding is currently at $37...
SOLD for $306.22
See the built kit HERE
Image: Greenleaf Dollhouse Forum