You should not speak for others,
parent obviously talks about the lowest value properties (colored brown) and upgrades such as houses and hotels.
Fair, but ftr, parent meant "installment" to mean financing not "improvement", and my 1980s edition has the lowest value properties colored purple. And if anyone can parse "Get the two brown ones first anyhow and with any kind of trade, and then for anything, if you are feeling stuck, offer to slash the rent," then color me a buffoon indeed.
The brown ones are the cheapest properties just next to the go square. Installments in the sense that if you cant pay x amount in 1 go, you can pay after 3-4 rounds, or take it out of rent. Just some offline modification we made to play the game.