I believe they keep them empty so they can visit at any time. They are their holiday homes. Some investors buy flats and keep them empty and in bubble wrap for

I believe they keep them empty so they can visit at any time. They are their holiday homes. Some investors buy flats and keep them empty and in bubble wrap for a couple of years until prices increase, then sell. Not "buy-to-let" investors, but "buy-to-sell"!