Building 21 School
| Name | Building 21 School |
| Grades | Class 09 to Class 12 |
| Address | 6501 Limekiln Pike |
| City | Philadelphia |
| School District | Philadelphia City SD |
| County | Philadelphia County |
| Zipcode | 19138 |
| Phone No. | (215)400-7450 |
| State | Pennsylvania |
| City | Large |
| Students | 397 |
| Teachers | 20 |
| Student Teacher Ratio | 19.6 students per teacher |
| Charter School | No |
| Magnet School | No |
Building 21 School is located at 6501 Limekiln Pike in Philadelphia city of Philadelphia County county in Pennsylvania. This school comes under Philadelphia City SD. You can call them at (215)400-7450 for more details. This is not a magnet school. Total three hundred ninety seven students from class 09 to class 12 study in this school who are taught by twenty teachers. This is not a charter school. The student teacher ratio of this school is 19.6.