turbotax changed depreciation percentage on 8829 business use of home

[musicnancy]

For years TurboTax used % of 3.1746% for depreciation percentage on my form 8829. This year, on the 2021 form, it was reduced to 2.5133%. Where did this come from? 

[PatriciaV]

Your property turned 32 years old in 2021. The depreciation percentage changes from 3.174% to 2.513% in year 32 of the life of some business properties. This will be the last year you will have depreciation expense for your home office.

See the depreciation schedule below, highlighted portion.