A letter from a mysterious entity inviting Hazel to rent-paid apartment in a city she'd only visited once smelled like a trap even without the part where she'd closed her eyes in Camp Jupiter's barracks and reopened them on the New York subway. Not to mention that this did not quite seem like the same New York she'd passed through with the legion. That New York had had bridges and ferries by which to reach other islands. She could have taken a bus out to Camp Half-blood from that New York. That New York had hotels for tourists, more apartment buildings than one and fewer ostriches.
At least she couldn't recall Percy mentioning any ostriches. Remembering the poison cows, however, she kept her distance, when she finally decided to scout out the appropriately named Ostrich's Villa, with one hand on the hilt of her golden sword.