UK's build-to-rent sector, dominated by corporate landlords, caters more to couples and singles than families.One in five new homes, and nearly 30% in London, are constructed by build-to-rent developers.Common Wealth thinktank raises concerns about reliance on private equity-backed developers to address housing crisis.Most top build-to-rent operators are backed by private equity firms, with some based overseas.Build-to-rent properties tend to house couples, flatshares, or single individuals, rather than families.Corporate landlords could be allocated significant land for property development in Labour's new towns initiative.The sector's housing typically caters to above-average income households.Build-to-rent model involves construction for private rentals only, not for individual sales.Criticism includes concerns about BTR developers maintaining property prices by controlling supply.Forecasts show growth potential in the build-to-rent market, attracting foreign funds due to stable income streams.