Some land will have a negative value for development, and you package it together when disposing it to get it off your hands, it is often 'given away' as a wider deal. All land has different values, and this can't be scrutinised by some desk top exercise without knowing all the abnormals, what should be under scrutiny is the process for disposal.Cheap land usually comes with contamination. The developers have to spend a fortune to clean it up and dispose it offsite. The land around the stadium was highly contaminated as a legacy of munitions factories....throw in an abandoned mine which the council had stuffed with landfill. I'm surprised they didn't have to give it away!
Doesn't excuse developers of every stripe and race weighing off their legal obligations to affordable housing under Section 106 (Planning). More than a little whiff of corruption.
If the developer gets away without s.106 affordable housing contributions it is is the Council's fault, however as the land owner the Council gets a higher receipt for the land without s.106 contributions, and a lot have double standards when selling off their own land.