how to buy back current lease from tenant so they can leave

[Aman Kaur]

We inherited a lease from a tenant for which the rent is very low for commercial retail space.  I tried to have a conversation with them to increase the rent via a mutual agreement but they said they cannot afford it. They  have contacted me to buy back their lease and pay them to leave.  I figured they know we want them to leave indirectly.  So what is the formula of how much I need to pay them or what would be the good negotiating strategy.  Current situation: $600/month for a 3000 sq.ft retail space. their current lease ends april 2023. Please provide your thoughts.