My 6th form Geography dissertation in 1996-97 was on diversification of industrial estates on Teesside, back then many older heavy industrial sites had been demolished & the sites were attracting light industries, technology companies, in Middlesbrough a football stadium & in Stockton on Tees, a University. That was over 20 years ago & a lot has changed since then with web commerce. If incentives aren’t there for at such companies & rates are too high then this is simply diversification again. I’d rather see houses on brownfield sites over greenfield.