Co-Op apartment are units defined as shares of a building. The owner of the Co-Op owns a fraction of the building and leasing, renovate or any decision regarding the usufruct is subject to decisions and approvals by all owners. This is considered as a personal property as the buyer owns shares, not real estate.​

A Multi-Family home is a single building that’s divided to accommodate one or several families living separately. They can range from a duplex, which has two dwellings within a single building, to homes or small apartment buildings.​

Brownstones are a certain type of Multi-Family defined mainly by the stones used for the construction. ​

Building materials are high quality with very good resistance over time compared for example to brick buildings. This type of real estate is the most prized by NYC people as they represent the success, quality, wealthiness, partly conveyed by the historical background of theses properties. ​

Brownstones market prices are more important than similar unit of the same size given the high demand and their ​luxury aspect.​