The Blackstone Group this month filed its long awaited initial public offering document on its Invitation Homes unit, a pioneer in single-family rentals and securitization of these assets. The 1,300 page Form S-11 is chock full of financial details on the real estate investment trust, including the revelation that the company continues to lose money. Through the first nine months of 2016 – the latest available data – Invitation Homes posted a net loss of $51.6 million compared to a $121.7 million loss in the same period a year earlier. The numbers and commentary in the filing indicate...