.... 239, § 8A, which explicitly limited a tenant's right to bring a counterclaim to premises "rented or leased for dwelling purposes," was clearly applicable only to summary process actions in residential cases, and where this court's decision in Wesson v. Leone Enters., Inc., 437 Mass. 708 (2002), adopting the rule of mutually dependent covenants for commercial leases, did...Mass. 708 (2002), adopting the rule of mutually dependent covenants for commercial leases, does not change the outcome in this case. The tenant did not terminate the lease or withhold rent in..., particularly given the adoption of the rule of mutually dependant covenants in commercial leases. See Wesson v. Leone Enters., Inc., 437 Mass...