[Someone]

Also, the population of Cairo is growing by about 2% a year. That means it will double in about 35 years.

Looking at https://www.macrotrends.net/cities/22812/cairo/population, that’s a slight slowdown from the 30 years it took them to go from 5 to 10 million or from 10 to 20 million, and looking at https://www.macrotrends.net/countries/EGY/egypt/population-g..., it may slow down further, but they need to build a lot of houses fast to accommodate that.