A partnership between Michael Ashkenazy and Peter Castellana bought three commercial properties in the Bronx for $18 million. The parcels, at 4720 Third Avenue, 4734 Third Avenue and 448 East 189th Street, are parking facilities in the Belmont neighborhood. The seller is Mayo Associates. This is not Ashkenazy and Castellana’s first joint venture. The pair are part of an entity that purchased two Marble Hill lots for $14 million last September.