“6.9.12 As less than 50% affordable housing is proposed a ‘GLA Three Dragons’ viability” appraisal is required to be submitted to accord with London Plan policy 3.12 and Hackney Core Strategy policy 20. This appraisal has been submitted along with additional explanatory information with regard to sales values build costs and information on the existing use value of the site. 6.9.13 The appraisal and accompanying information have been reviewed by external consultants appointed by Property Services surveyors. The appraisal shows that provision of affordable housing is constrained by the site constraints such as proximity to a number of heritage assets, which limits the scale of development that can accommodated on site. When taking into account the existing use value of the site, build costs and associated professional fees for the development, alongside potential sales values from residential units and rental yield from the proposed retail unit, the amount of affordable housing proposed is the maximum amount that can be reasonably achieved on the site. 6.9.14 It should be noted that the Core Strategy 50% affordable housing target was developed at a time when grant funding was available from the Homes and Communities Agency to deliver affordable housing. When such funding was available the Council’s Affordable Housing Viability Study which forms part of the evidence base for the Core Strategy noted that 50% affordable housing would be achievable in a high number of scenarios. When grant funding is not available then the 50% affordable target is only achievable in a limited number of scenarios, usually involving sites with low existing use values. 6.9.15 Both London Plan and Core Strategy policies therefore recognise that the 50% target is an aspiration and not a minimum standard, and lower proportions may be acceptable. This needs to be assessed on a site specific basis taking into account scheme viability. It should also be noted that a greater amount of affordable housing has been submitted in comparison to the previously refused scheme on this site (ref: 2009/1264, see history section). In addition the amount of affordable housing has been fully justified in terms of viability. As such the Planning Service consider that the proposed affordable housing provision complies with Core Strategy Policy 20, London Plan policy 3.12 and emerging DMLP policy 21.”