<s>[INST] A construction company is building a new complex on a downtown block bounded by Main St, Elm St, Oak St and West St. The company has chosen a rectangular building shape. Given the following map constraints:
1. The southern edge of the building cannot be closer to Main St than 30 feet.
2. The northern edge of the building cannot be more than 170 feet away from Main St.
3. The eastern edge of the building cannot be closer to Elm St than 20 feet.
4. The western edge of the building cannot be more than 180 feet away from Elm St.
What is the maximum area the building can cover in square feet?[/INST]