@Rafal Mielniczek that sounds like a great deal!! 20 unit building...thumbs up to you!
I currently live in Little Ferry and have been watching and researching all of northern Bergen county along with some of Hudson and Essex for almost 2 years. I have thought about possibly buying a multi in Hackensack, but it doesn't meet my wife's criteria.
the main areas of growth are along the main street area (courts and river street). there a new building going up on main street and mercer. Its supposed to be 14 story's with a lot of residentials a few commercial on the bottom. It is a great area, near the park, river, stores, govmt buildings along with a good coffee shop (71 main street)
not sure where your building will be, but if you get the chance, check out
http://uppermain.org/
the main street alliance has been around for years.
the other major area is a triangle of construction is btwn RT17, Maywood ave & central ave.***this is Maywood, but near Hackensack. I don't know what is being built there. my guess is office space. there was a single family listed for sale along Maywood ave for almost 8months.
**if I were to purchase in Hackensack, it would be near the hospital & east of the train tracks. remember, Maywood residents send their kids to HS in Hackensack. The town is currently trying to figure a way to send them to Paramus.