The fetus was found on Tuesday at 10 a.m, police and NYCHA officials said.
A man lured the woman into a West 32nd Street stairwell, police said.
The blaze broke out around 1:25 a.m. and was brought under control about an hour later.
The earlier-than-expected opening was hampered by the subsequent closure of the Broadway stairway.
An ad for the spooky show was too "shocking and menacing," a lawsuit charges.
The high-rise public address systems would tell residents whether stairwells are safe during a fire.
Officials were checking the stability of the 6-story walkup at 29 E. 104th St., which has 33 apartments.
The suspect, wanted for a similar attack last year, tried to attack the 19 year-old girl at knife-point Thursday night.
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