developer harry macklowe’s macklowe properties and dilmon llc the family office of qatar’s hamad bin khalifa al thani are seeking a loan of at least 11 billion to help refinance one wall street a former manhattan office tower that has been converted into condominiums macklowe and dilmon are working with newmark to solicit fiveyear nonrecourse mortgage financing proposals from prospective lenders according to a memorandum reviewed by bloomberg  at 11 billion the financing would represent a 48 loantocost ratio and proceeds are earmarked to repay construction debt and fund remaining construction costs among other uses the memo shows