That’s not true. Their land and their old training ground was built near Paseo de la Castellana in 1963, but back then it was on outskirts of the city.

That land was worth fuck ton after 30 years when city grew, this is what the build on it after:

https://en.wikipedia.org/wiki/Cuatro_Torres_Business_Area

They moved to unconnected unbuilt outskirts of Madrid once again, which are still half-empty to this day, called Valdebebas.

Here’s HITC Sevens episode about it, when I learned it from:

https://youtu.be/ao5gccLtRL8?si=3EfB8NVAbfrOsg3e&t=319

Here’s article about it, title is:

“EU Court rules Real Madrid got no state aid in land deal”

https://www.euronews.com/2019/05/22/eu-court-rules-real-madrid-got-no-state-aid-in-land-deal