What can alter a tenancy relationship?

The correct answer centers on "conduct" as a factor that can alter a tenancy relationship. In the context of real estate law, the conduct of the parties involved in a tenancy can significantly impact their obligations and rights under the lease. For instance, if a tenant begins to engage in behavior that breaches the terms of the lease, such as failing to pay rent or violating property regulations, this conduct may lead to modifications in the tenancy, potentially resulting in eviction or a renegotiation of terms. Likewise, if a landlord fails to uphold their obligations, such as providing essential services or maintenance, this disparity can alter the dynamics of their relationship.

While the tenant's discretion can influence decisions within the bounds of their rights, it does not inherently alter the legal relationship itself. The duration is a fixed term that outlines the period of the tenancy, further establishing the relationship rather than altering it. A written agreement certainly sets the foundational terms and conditions of the tenancy, but it is the conduct of both parties that can actively change the nature and enforcement of the tenancy throughout its duration. Therefore, conduct is the most directly relevant factor that can lead to changes in a tenancy relationship.