Lisa has nowhere to go.
She’s been kicked out of her apartment in Queens by her alcoholic boyfriend and has no other friends in the city. A co-worker tells her about a house on Staten Island where she can live in rent-free, but Lisa comes to realize the price that comes with living in an abandoned house.
Abandoned by Carol McMahon is a ghost story without a ghost. The lengthy set-up, with the building's condition being described over and over, is completely unnecessary. The descriptions of the nighttime activity is terrifying, especially since Lisa lives by herself. The ending is confusing and doesn't offer any explanation of what was happening.
I would have enjoyed some connection to Grace...maybe she knew there is something evil in the building and she deliberately invites people to stay at the apartment to feed whatever is in the building. Alas, not the case.