How much does it cost for a night at the Seneca Hotel in Chicago?

As an AI language model, I don't have real-time access to pricing information and cannot provide an accurate cost for a night at the Seneca Hotel in Chicago.

However, prices for hotel stays can vary depending on several factors such as the time of year, day of the week, type of room, occupancy, availability, and any special promotions or discounts offered by the hotel.

To obtain the most up-to-date and accurate pricing information for a specific date and room type, it's best to check directly with the Seneca Hotel's website, call their reservations department, or use an online travel booking platform like Booking.com or Hotels.com.

These platforms often provide real-time availability and pricing information, allowing you to compare different room types and rates to find the best deals.