3.34% as of 2016Jun29 for a fixed 30 year mortgage.
http://finance.yahoo.com/news/30-fixed-mortgage-rates-fall-1...
http://finance.yahoo.com/news/30-fixed-mortgage-rates-fall-1...
And this is not theoretical, the usual way to get a mortgage around here is Euribor with a margin for the bank added, practically no-one gets decades-long fixed mortgages.