N.J. Stat. Ann. § 40A:2-20

The cost of an improvement or property may include interest on obligations until the end of the fiscal year in which the obligations are issued or until 6 months after the completion of construction or acquisition, and architect's fees, accounting, engineering and inspection costs, legal expenses, costs of authorizing, selling and issuing obligations, preliminary planning, test and survey expenses, and a reasonable proportion of the compensation and expenses of employees of a local unit in connection with the construction or acquisition of such improvement or property.