My current theory is that John Place was a brother of Lydia Place. In poking around in documents I already have, John now jumps out as a business partner of Stephen C Duryea in the grocery business. They are mentioned in a deed in 1836, taking over the lease of 309 Spring Street in New York City from John H. Duryea, deceased.
|New York City deed book 362, page 294|
John Place is found in New York City in the 1850 census- on the same page as George W. Duryea (brother of Stephen and John) and Fannie Brewer (their sister).
|1850 United States Federal Census, New York Ward 8, New York, New York; roll M432_542, page 241B, lines 19-22.|