The Dutch House
My favorite from Ann Patchett. Everyone I know who has read this book absolutely loved it, which makes it very easy to recommend! Recommended for ages 16+, I think, though I'm not sure a teen will enjoy it as much as you will, and it wasn't written for young adults.
FROM THE PUBLISHER:
At the end of the Second World War, Cyril Conroy combines luck and a single canny investment to begin an enormous real estate empire, propelling his family from poverty to enormous wealth. His first order of business is to buy the Dutch House, a lavish estate in the suburbs outside of Philadelphia. Meant as a surprise for his wife, the house sets in motion the undoing of everyone he loves.