North American Company for Life and Health Insurance provided the loan on Murray Hill property, according to city records. The deal included $8.4 million in new debt.
Representatives for Moinian and North American did not immediately respond to requests for comment.
WeWork signed a lease in July to take roughly 50,000 square feet across six floors of the 12-story building. Other tenants include co-working space provider Work Better and tech company ShopKeep.
Joseph Moinian bought the property in 1982 and has described it as his first “serious office building.”