It's all a pretty tricky business.
@wenchsenior had a good point - but here's how our neighborhood is. We bought 15 years ago, and didn't really know anyone for a long long time.
We knew our back neighbors (the lot was split in the 50s, so our driveway goes to someone else's house). They moved, and then we really got to know the new neighbor. But that was it, for quite a long time. When you are working full time, that's how it goes.
This used to be a really working class neighborhood. It still is, to a degree, because only about half of the houses have turned over in the last 15 years. But it will depend a lot on when you bought. A small, 1940s or 1950s 2 BR ranch will run you $900k now. So...working class people aren't buying those houses. They *did* buy at the bottom of the market in 2011/2012, and some bought in the 1990s or early 00's before the run up. I haven't seen a great amount of gentrification, but a fair bit of accessory dwelling units, which is how many can afford it.
Fast forward to 15 years later, and I know a LOT of my neighbors. Many through kids. On our street and the next one alone, I have at least 7 families in my contacts. Many of us get together every Sunday for a potluck. These are my people. I know the names of at least a few more than that.
Onto housing. I live in So Cal, in a coastal community. It's beautiful here, and insanely expensive. Our city, and many like the bay area, are between a rock and a hard place. It's really really hard to build the amount of housing needed for the increased population. The politics and funding are difficult.
For example, did you know that the state of California requires builders to specify where the water is going to come from before they build a new community "somewhere new"? Makes total sense, right? Before you build a new city just outside the last city in the greater expanse of Los Angeles, figure out where these people are going to get their water.
Yet the same thing is NOT done for existing cities. My city is expected to build >3000 new units in the next 4 years. Um, where? We aren't even really out of the drought and we are living on borrowed time and borrowed water. For some reason, the state doesn't really give a shit about water if you are forcing areas to build. And then, there's little to no coordination between cities. A city near ours built SO MUCH in the last 5 years that traffic has gotten much worse.
I honestly cannot blame locals, or people who have lived here a long time, to be unhappy about change. They like their 10 minute commutes. They don't want the new traffic, they don't want the new density (that comes with very little parking). They just want zero growth and the same quality of life. Equally strident are the people who want more affordable housing. Our rental vacancy rate is 1%. That's insanely low. Rental costs are very high. However nothing has worked. We allowed a couple of larger, more dense projects to go up to address the housing shortage, and the fucking developer built uber-expensive apartments that are $3000-4500 a month, for a 1-2BR apartment. And you want to know something? They are empty. (This ain't the bay area with the associated salaries.)
The bad thing is that it is so hard to find a happy medium. At first, I HATED the ADU law that the gov signed (accessory dwelling unit, requiring cities allow these, period - no restrictions). I though the AUD (Average unit density, high density) was a good idea. Now I've flipped it. Our city requires ADUs to be owner occupied - which means people are being a lot more mindful of what happens in the neighborhood. AUDs and developers kind of suck.
I figure that we have SO MANY vacancies in commercial real estate that maybe there will be talk about converting them to condos or apartments. And as long as a certain % are affordable (seriously, stop letting people "out" of that), then it may work.
But it may not. Commercial issues come from on line shopping, and the homeless population, which means locals and tourists avoid downtown.
Added to that - homelessness itself is a problem that is hard to fix
And not everyone can afford to live here. After spending 5 years in DC, it was easy to learn that. This town is never going to have the mix that it did in the 1950s.