I'd like to add two things to this discussion.
One is that many/most Broadway theaters are landmarks so they can't easily become...condos, parking lots, etc. Many have already sold their air rights to other developers so they can't easily go up, anyway.
Two is that almost all the theaters are owned by privately owned corporations: Shubert Organization which owns the most theaters by far, Nederlander, Jujamcyn, or by not-for-profit theaters. The exceptions are one owned by the City of New York and leased to Disney for a long time and little money, and one recently bought by Ambassador Theatre Group, a large British-based entertainment behemoth, the Lyric, and another ATG leased longterm from the Millennium Hotel, the Hudson. [Oops, left out the Roundabout which is privately held.]
These two facts add to the difficulty---near impossibility---of determining the worth of a Broadway theater. Add that the only way to know the worth of something for sure is for it to sell in a arms-length transaction, and one sees there is little data.
Updated On: 6/24/20 at 10:12 AM