I remember it seemed so big at the time, but our half was only 1520' sq (141 sq.m)- we had the left side. My parents bought it for less than $20,000 and sold it for a little over $100,000 in the 1980s, and today it's valued at $560,000 (which seems like a lot, but the apartment downstairs gives it rental income potential). It looks way different from when we had it- the neighborhood went from middle-class to upper-middle-class over the last 10 years or so as 'hipsters' took over much of Brooklyn and jacked up the property values- if today someone earned the equivalent of what my dad made when he bought the house, they wouldn't be able to afford it- times really change.
Got a pic of your original house?