1. lower income neighborhood becomes trendy because poor artists (read: cool people) live there because it's cheap.
2. Rich people who want to be cool start to also move there for more access to culture.
3. This is the "sauce": Wealthy developers buy up 3 story homes and convert them into 3 apartments. (I live in one.)
4. They then rent these apartments out at rates that are "affordable" to a person willing to live with 4 other roommates.
5. The poor lower income people (read: families) that used to live there are getting priced out due to the wealthy developers and "single" people who are banding together.
Now, your point about comparing to my parents: they purchased a house when they were 2 years younger than I am now. (mid late 20's) I work in tech, so I make close to 2-3x more than most of my non-tech friends. I'm still about ~4 years away from comfortably being able to put a downpayment on a home in anywhere I want to live and I live debt free and am an aggressive saver.
For most of my non-tech friends, home ownership is literally a dream.
Again, this is just what I hear, not what I know, but it is possible that this is at least part of the explanation.
My wife worked for a utility at the time and noticed this when things started picking up. About 100 different LLCs bought 600 properties in one area all with 3 billing addresses.
One of the other posters described it best. Capital is both more sophisticated and dumb. We’re in an era very different than anything that has happened before.
Stagnant cities and (especially) their outlying freeway sprawl are cheaper than ever.