BUILDINGS, building-like areas and other constructables available to permanently construct, purchase and/or upgrade in the game
Common characteristics:
Buildings are permanent, i.e. they remain in the game from one session to another (unlike plants in Plants vs. Zombies 2)
Generate resources or grant other benefits (generate troops, items, give boost etc.)
Can be constructed/purchased and/or upgraded by the player
Examples:
Permanent buildings which are constructed by the player and generate resources (e.g. Gold Mines in Clash of Clans)
Permanent buildings which can be upgraded by the player, even though they are not initially constructed by him/her (e.g. Walls in Game of War: Fire Age)
Permanent furniture and kitchen appliances which can be purchased to improve your restaurant’s potential (e.g. Restaurant Story)
NOTE
A single entity in a game can be classified as only one of the following: CHARACTER, UNIT, BUILDING! For example, UNITS are not CHARACTERS, as UNITS can die permanently and can be trained/created from e.g. barracks in large numbers over and over again if you just have enough resources.