What is the type of concession if a landlord decreases a tenant's first two months' rent?

The correct choice is a rental concession. This term specifically refers to a reduction in rent or financial incentives given to tenants, typically during the initial period of a lease. By decreasing the rent for the first two months, the landlord is providing a direct financial benefit designed to attract tenants, especially in competitive rental markets or to fill vacancies quickly.

A lease concession generally refers to a broader category of incentives that may include not only rent reductions but also other benefits such as waiving fees or providing extra amenities. While it is related, the more precise term for the specific action taken in this scenario — a decrease in rent — is better described as a rental concession.

Service concessions and utility concessions do not relate to rent payment reductions; they typically involve additional services or utilities provided or discounted by the landlord, rather than changes to the rent itself. Therefore, in this context, rental concession is the most appropriate term to use for a situation involving a decrease in monthly rent.