Tenant of 10 years wants a new paint job due to cracking

[Juneau Dahl]

We have cracking issues on a duplex in CA due to bad soil/earthquakes - the cracks always reappear. We've taken care of cracks/painted every time there's a new tenant but this tenant has stayed longer than most (nearly a decade now). He wants the cracks patched and the house repainted for aesthetic reasons. Is this our responsibility? I think the job would cost around $2500-3000