I make below median for my area and own 5 houses. I can't afford to buy a house where I work so I rent there. The other 5 I bought gradually, and all are mortgaged. They barely pay for theirselves but in 30 years when the mortgages are paid off I will have a modest retirement income source.
You can call me upper class, but the fact that my income is below median and I can't afford a house where I live makes your definition quite strange. I do a lot of other things that are strange for upper class, such as doing most of the handyman work myself, at least when I lived near the houses.
I've helped several tenants get their shit together and guided them through buying their own house. One of them has several houses now and calls me a role model. All my tenants are grateful for me helping them have a decent place to live at a fair price.
Working poor live paycheck to paycheck, a single setback can often result in bankruptcy or eviction. Upper class I'd say is people in the top quintile of income. There are plenty of people like myself, solidly middle class, who have eked out a modest real estate portfolio. I don't know why you are determined to see us as upper class, but the attitude isn't helpful.