When illegals aliens arrive in New York City (NYC), they have to live somewhere and it won't be for free. Hence, NYC Landlords have lots of pricing power and can pick whoever pays the most rent. Hence, those NYC Immigrants who think a Wall is racist should look at their housing costs & ask, Would rents go higher with more illegals in New York City?
Since the US / Mexico Border is porous, there are just too many illegal aliens moving to New York City. By putting a WALL, you slow down migration and hence you give time for housing stock to catch up and allow for housing stock supply & demand to balance out instead of Bubbling Up, and Bursting.
Newer Illegal Aliens are desperate & will undercut any existing Immigrant Worker in NYC, legal or illegal.
Can you expect all those Illegal Aliens not to work for less? No, you can't.
Accordingly, that puts salary & hourly wage rate pressure on Existing Immigrant Workers in NYC, legal or illegal. New York City Immigrants can't have it both ways. They can't support illegal immigration and expect to have the same salaries.