Discussing Elliot school in south London selling off some of it's land, Steve Davies argues that schools must prioritise as they do not have unlimited resources. Ultimately schools will have to trade off part of their missions as they do not have infinite means.
In education, as in any other area of life, we have to make most efficient use of resources possible and in this case the school will be enhanced by turning some of unused land into cash.
Listen here.  Segment starts around 12.00.