Yes, I will mark off for spelling.

We drove past a small office building the other day that had a large, colorful, professionally-printed banner out front advertising that it had space for lease.  Along with the phone number, etc, was the advisement that it was a "multi-tennet building."

I've seen 'tenet' in place of 'tenant' many times, but at least that's a real (if incorrectly-used) word which passes the spellcheck test.  It boggles the mind that at no point in the process of ordering and printing and paying for this sign did anyone bother to make sure they knew how to spell the word they obviously thought they knew how to spell.

Maybe at some point they'd spelled 'tenant' 'tenet' and someone told them, "No, it has two Ns?"