Here is the conclusion of my approach to Monopoly City Streets.
6- Sabotage and Bonus Buildings – Although I recommend never sabotaging, it is of course possible that someone else will sabotage your streets. Early in my days at this game, I would build many Green Houses because I was trying to trigger a demolition card to remove a Hazard building, or a Bonus Building to protect my street. Of course this tactic quickly filled up my streets with low paying buildings and triggered many other cards that I did not want.
So I abandoned that approach. The card will turn up eventually without me trying to make it happen.
Also, you can build a Bonus Building on a street that already has a Hazard and that will counter the sabotage without actually removing the Hazard.
Build 2 Bonuses on each street, and even 3 on the longest ones, because anyone looking to sabotage you, will probably pass you by to hit a less prepared opponent.
7- It is better to reduce the likelihood of sabotage, so I focus on equalizing the value of all my streets to not attract attention in the first place.
Let’s say 4 of my streets are valued at $2M each but the 5th is valued at $10M, it stands out like a billboard that says “Sabotage Me”.
Even if the original prices of my streets are very different, I buy buildings on the lower value streets first to raise the value to match the others, and then equally from then on. If my Revenue is $50M, I divide it by 5 streets and build a $10M building on each street.
8- Fines – Few things are as hateful as the Chance cards that fine you almost all your money, especially in contrast to the cards that win such little money for you.
I haven’t found anyway to predict or avoid the occurrence of these cards, but I do have a strategy for minimizing their impact.
Since it appears that the fine is a percentage of your current bank balance, it is best to lower the balance before getting this card. So, as soon as I receive my Revenue for the day, I immediately buy the largest buildings I can afford. When the “fine” card eventually appears, I have already spent most of my money, so even a 75% fine is relatively small in dollars.
While it remains possible that this card can turn up early in your turn, it rarely does.
Have fun and good luck.
-Scott