"Due to a very restrictive use permit, we are not allowed to receive visitors.

Please accept our sincere apologies."

From their website.

hi - i've managed to sneak in a visit august this summer

my friend emailed them and mentioned that i was an architecture student and that we'd really appreciate a visit

they didn't actually allow us to go upstairs at all which was kind of lame, but we tired making friends and this girl who was a wine researcher of some sort there let us sneak a peak upstairs... (we caught her on her way home from work...)

hope this helps - just be persistent and email them - although if they don't allow you to go upstairs, it may not be worth it

apply at valley architects, the resident architecture firm for dominus estate. use their free pass and copy the drawings...

hah, thanks.