Jane Butterfield is the realtor and a pest of sorts.
Jane is one of the pushy sorts, as she was insistent to the point of annoyance that the Maitlands should sell the house to a family with children... claims it is too big for just two people. Although Barbara firmly told her not to, Jane had been showing pictures of the Maitlands' home to people (specifically, customers in New York) long before it was officially for sale. She even stuck her face onto the window of Adam's basement workshop to ask him to sell the place even even after Barbara said no!
When the Maitlands died, she gave no consideration to their last requests and, without considering their tastes, immediately sold the house to the Deetzes.
"Any advice in that area have him call me."
- It's unknown whether or not she appeared in the animated series.