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Came across these at an estate sale. I thought they were wood Monopoly houses, but I'm not certain. They were in a box (no top) that looked like it was from one of the earlier monopoly game, but there were also a game piece and instructions from a Clue game. Also inside were property "boards" from a Monopoly game.
Each Monopoly set comes with 32 green houses and 12 red hotels. Originally they were wood, then plastic and today molded resin.
Milton Bradley also makes a similar game called "Boardwalk" that has grey, maroon, pink, and yellow houses.
It appears you have some of each.
Once again thank you for your expertise.