Merlin Entertainments, the biggest tourist attraction company in the world (the biggest is Walt Disney, duh) has signed a lease with the former wax museum building to open a Madame Tussauds wax museum in the old space, as well as they're opening a San Francisco Dungeon in July at the same location (145 Jefferson).
From the website, it looks like the dungeon is an attraction in which visitors take an underground boat ride while nine actors regale them with tales of San Francisco history, complete with special effects. The website also points out (twice) that the experience is "hilarious fun and sometimes a bit scary."
Merlin, whose other attractions include Sea Life Aquarium and Legoland, has dungeons all over Europe, and San Francisco's will be its first United States location.
Also, if you're down to get paid to dress up and tell scary stories to tourists, they're hiring.