Yeah, I'm not too sure about the dimensions of the building. It's been a while since I've last visited school.

There is a building [1] parallel to the Second Eleven Field. This building houses the cafeteria [0], as well as other utility buildings like the Union Bank office and the uniform / stationary shop.  

[0]: https://bishopcottonboysschool.edu.in/sites/default/files/styles/large/public/Cafeterias.jpeg
[1]: https://bishopcottonboysschool.edu.in/sites/default/files/school_map.jpg