Need a court order.

Expensive but legal.

If forcefully evicted, the occupier can sue back leading to more expenses.

Consult a lawyer for this.

Whichever route u take, ensure that the occupier sign the letter to vacate voluntary to protect yourself. Otherwise, in months or years later, the occupier can sue u back.

That's why banks cannot simply kick anyone out especially after they defaulted on the loan. This is true for residential properties which has higher protection for tenants.

If commercial properties, u can kick them out legally with just a simple letter and lock change. That's what my lawyer said some time back.

Only residential, u at the mercy of the tenant. That's why some owners would prefer the court order route which is not only expensive but legal.