1. Massachusetts General Laws (M.G.L.) c. 112, § 87PP. This statute defines a "real estate broker," under whose license property management is conducted. The definition explicitly includes one who "for another and for a fee... negotiates... the lease of any real estate." This establishes lease negotiation as a legally defined brokerage activity and a core function of a property manager.
2. Kyle, R. C., & Baird, F. M. (2016). Property Management (10th ed.). OnCourse Learning. In Chapter 1, "The Professional Property Manager," the text outlines the primary responsibilities, stating, "The manager's first responsibility is to realize the maximum profit for the owner... This is accomplished by... effective marketing, and tenant selection and retention" (p. 12). The process of marketing and tenant selection inherently includes negotiating lease terms.
3. Jacobus, C. J. (2022). Real Estate Principles (13th ed.). OnCourse Learning. Chapter 19, "Property Management," describes the functions of a property manager as established by the management agreement. It specifies that a key function is "renting the property," which involves "establishing a rental schedule... and negotiating leases" (Section: The Management Agreement).