The ugly green thing is one of many buildings in Hackensack that is owned by Nigito Realty, located in River Edge. The family hails from Hackensack, but the children own the business now I think, and I doubt they still live here. They only own 2 buildings that they put some effort into maintaining, one is 333 Park St, and the other is a 3-story apartment on the north side of Essex, just east of Rowland Ave.
Some of Nigito's worst properties include the NE corner Prospect and Essex, most of the northern block of Fair Street, 2 old buildings at SW corner of Second and Beech, and one on Prospect Ave just north of the HUMC entrance. And I think they still own most of the apartments bounded by Main, Anderson, River St, and Ward St.
They own the entire corner of Hudson and East Kansas. Two other very old houses also painted one entire color. I think one is blue, one is yellow. That's the hallmark of a slumlord. Most people paint the exterior trim another color, sometimes white, or sometimes a darker color than that house. The purpose of trim is to stand out and dress up the curb appeal of a house. It's cheapest to hire a bunch of unlicensed workers to paint a house all one color, so the worst landlords go that route.