2nd Avenue

Poor 2^nd Avenue. It’s the first numbered avenue, yet everyone raves (rightly) about Arguello. Second Avenue is also the shortest of the numbered avenues; and, truth be told, there aren’t many businesses on it. So it remains largely un-​Yelped.
But pity reviews don’t garner more than three stars for pity alone. You see, 2^nd Avenue also has a hidden treasure. If you’re anything like me, you already know about this oddity of public-​works inattention. If you don’t know what I’m talking about, I encourage you to scour 2^nd Avenue’s entire length to find the secret treasure of which I speak.
The first person who correctly identifies this oddity and sends me a compliment detailing it and its location shall receive $ 5 from me. That is a contract. Let me repeat; if you are the first person to tell me what I’m talking about in a Unilocal compliment, I will give you five one-​dollar bills.