There is of course, some effect but it's relatively minor for the middle class. Someone who's making a good income is not going to settle for the same conditions an illegal immigrant does, they're not competing in the same market. Your analysis leaves out a bunch of realities, for example: Most illegal immigrants share housing, reducing pressure compared to the normal. They also tend to stick to immigrant neighborhoods due to language barrier and need for cash transactions, this reduces their impact outside these areas. There is such a thing as homelessness more population on the lower income scale doesn't always mean that property values go up due to resources being taken since some will end up homeless. People tend to get the best they can afford, if illegal immigrants are taking the lower end of the market the legal people aren't just going to start buying "better" places.

Illegal immigrants have a negligible effect on the property values of the type of property people putting up walls and fences around their homes own. And lastly I highly doubt anyone who's against the border wall is realistically thinking "this will keep my property values up!"

>There is of course, some effect but it's relatively minor for the middle class

This was my only point, because low and middle class markets and income are continuous spectra, and displacement at the base puts pressure on the rest of the continuum. People don't typically end up homeless because of a couple percent increase in rent, they find a way to pay it. Now, the exact quantitative effect on pricing throughout the market is something that neither of us can likely provide.

>Your analysis leaves out a bunch of realities...outside these areas.

And what happens when these areas fill up and start to influence surrounding neighborhoods? What about the increased strain on infrastructure, including roads, schools, police, fire, etc, especially by those who do not pay taxes?

What about the effect on markets cause by middle income flight post spillover, when these growing low income neighborhoods bring with them crime and other undesirable activity?

No amount of arguing over left out "realities" changes the simple fact that more people create increased local demand in housing starved locales, which puts upward pressure on all markets, although of course the derivative of income pressure vs population decreases with increasing housing prices.

>People tend to get the best they can afford

"Best" is highly subjective and dependent entirely on market rates. People will pay more for less if the whole market is inflated by pressure from below.

To be clear, I am not interested in blaming immigrants, legal or otherwise, for any of societies problems. I am simply arguing that more people>increased demand>higher price.