We moved to this little 5,000-person town, just over a year ago. We wanted to get out of the city, have some privacy, etc.. We didn't know much about the town, but we've learned to like it. It's tiny, quaint, with just enough stuff to keep us from having to drive 15 minutes to get most of our necessities. We live about 5 minutes from downtown.

Now, it turns out that some local real estate developers have bought essentially all the land between our house and the town, 7500 acres, and they have big plans for it. They want to make a city. They want to build twenty-two-thousand homes, mixed in with a handful of "corporate campuses". They anticipate sixty-thousand people. Again, there are 5,000 people in the town right now.

22,000 houses on 7,500 acres (minus room for roads, businesses, utilities, setbacks near the river and lake, etc.) makes for some small lots for this part of the area. We're on a bit more than two acres, and most of the people around us have at least that much. So, that would probably do good things to our property value, if we stuck around long enough. But, wow: that will completely change the area.

Update:
And if you want to move out to the coast, I just learned that the same company wants to develop 200 acres in the coastal little town that we like to visit. Sigh.