Basically my Mod request draws from AoW2's setup of buildings requiring a certain city level in order to build. For instance the master builders guild, great temple being buildable in city level town. Here I will give my own set up for this idea.

Out post - Barracks, storehouse, Shrine, wooden wall, Harvester Guild, Embalmer's Guild

Village - Builder's Hall, Laboratory, Arena, Shooting grounds, Harbor, Rogue's Palace, Arch Druid's Dolmen, Necromancer's Dark Tower, Sorcerer's Conflux,

Town - Siege Workshop, Ware Hall, Temple, Public Baths, Stone walls, Foundry, Henge, Theocrat's Conclave, Warlords Command, Burial Grounds

City - Master's Guild, Observatory, Racial Defense Tower, Grand temple, hospital, Mana Vault, Planar Gate, Shrouded Alter, Blast furnace, Megalith, Celestial Chamber, Gladiator Pit, Basilica, Cathedral of Bones

Metropolis - Grand palace, Palace of the Perished, Arcane Item forge, Wizard Academy, Industrial Plant, Holy of Holies, Great Beast Lair,

Comments suggestions etc by all means postem.