Environment - these structures either serve function purposed (paths, houses, etc), or provide a boost to the surrounding scenery.
Shops - Sells goods for a range of gold.
Facilities - Sells services, or provides a function (castle, park, etc).
Combos are an important aspect in where to place structures, as they raise the yield / price of structures in the combo, as well as those in the surround area.
For buildings to be unlocked, some unlock requirements is to build a number of buildings. The definition of buildings are structures that are shops or facilities but not enviroments' structures. Also Castles, Parks and Inns are also not considered buildings and will not be counted toward the requirements.
Every year at M11W3, the total yield of your town is counted and ranked. For a full explanation how yield is ranked go to the Yield Rankings page.
When you reach a certain rank for the first time, the game will automatically award and unlock special structures. If you already unlocked all the possible awards, the game will choose a random award from the possible ranking awards.
For example if you reach ranking 40 and already received Hot Spring, Daibutsu, Magistrate and 5-Rf Tower before, then the game will choose a random structure from those 4 possible awards and reward it to you.
While remodeling requires a certain number of gold in the resident's wallet, remodeling doesn't actually decrease the amount of gold in their wallet. If a path is required next to the house, it must be immediately adjacent:
Where H is house, A is adjacent. Residents don't always remodel their homes as soon as the conditions are met, as when they remodel seems a little random. A trick to make sure they remodel before spending their gold is to save the game when they are on the way to their house while they have enough gold, and reload the game if they leave their house without remodeling it. Each remodel requires the model before it. ex: along with the listed conditions, the wooden house would first require the thatched house, you would not just be able to jump from the hut to the wooden house.
Rent (% of land price)
Wallet: 35G+, Job Lvl 3+
Wallet: 50G+, Job Lvl 4+, Total Job Lvl: 6+
Wallet: 54G+, Path: Gravel Path?, Total Job Lvl: 13+
Wallet: 70G+, Path: Stone Path?. Total Job Lvl: 25