Source is me. I worked at a major PE firm in a past life doing exactly that. Also check who's the new landlord at many European cities - Paris, Munich, Frankfurt, Stockholm, Copenhagen.... More often than not it's either of the two American investment firms which start with B (and I worked at one of them). European real estate is highly attractive to hedge fund investors because of stable growth and low volatility due to forced undersupply - much better for them than actually working for their 2 and 20 paycheck.

Hmm so anecdata