How to get owner incentivized to sell despite capital gains tax?

[Izaiah Barba]

Hi BP community, I hope all is well and everyone had a nice time over the Holidays. 

There's an owner who is looking to dispose his entire portfolio but is selling one property every year to mitigate his capital gains tax. Do you guys have any suggestions on how to create a win win scenario to get the owner to sell all his properties in this upcoming year of 2021? He is an older gentleman that is looking to retire as soon as he can, but the capital gains tax is holding him back.