The costs which you say the residents were quoted are ridiculous but typical of large corporate feasibility studies. Given the 22 flats averaged just over 60sqm each that's approx 2,800/sqm. Totally nuts. Even the ever cautious RICS has build costs guides of £950 (standard quality)-1550/sqm (excellent quality) for small build projects - let alone projects with the economies of scale available on an intensive site like this one. Whatever your opinion of Lexadon, they hold their properties long term so have no nothing to gain from doing work to anything but a decent standard. I would guess they managed a good job for 60-80K per flat using their own regular building team and cutting out lots of professionals who work on percentages. I looked around the site after it was repossessed - it was way beyond a cosmetic overhaul.