From Longman Dictionary of Contemporary Englishsight unseensight unseenif you buy or choose something sight unseen, you do it without looking at the thing first I can’t believe you would rent a place sight unseen. → sight
Examples from the Corpus
sight unseen• He bought his house sight unseen, sold on the location.• If I didn't take the car, the other guy was willing to buy it sight unseen.• The principal said he offered me the Position sight unseen based on my letter of application and my resume.• But nothing's worse than driving into an auto repair shop, sight unseen, and being fleeced.• Taking a risk, I ordered five each of six Victorian species, sight unseen. 