An interesting question, and a tough one to answer. Here is the story:
The house on 78th Street was modified by Fritz Hofman in the late 1980s or early 1990s to add an observatory. He installed a 16-foot long refractor telescope with a 12-inch lens. It weighs in at over 1 ton. At the time it was installed it was one of the largest privately owned telescopes in the country. It may still be. About 20 years ago the telescope cost over $30,000 and the modifications to the house were another $30,000. I believe Mr. Hoffman owns this house and telescope.
Thanks for an interesting question.
Answered: August 10, 2011