Step 1 : Introduction to the question "What color are the houses in the classic version of Monopoly?"
In the classic version of Monopoly, houses are small green buildings while hotels are larger red buildings. Houses can only be bought when a player owns all the properties in that color group. The price for each house is listed on each property card. You can NOT build on railway roads or build on mortgaged properties. The purpose of houses and hotels is to increase the rent of a property when an opponent lands on it. This is the most evident and easiest way to win at Monopoly. The more houses, the higher the rent rises.