Basis of depreciation calculation - sale price? tax assessment?

[Karen Young]

Good morning everyone!

Let me thank you in advance for taking the time to help us newbies!

Question: to calculate depreciation, what price do you use? the county tax assessment, the sale price, or the appraisal price?

2nd Question: what percentage do you use to subtract the land?

The property is a condo in SC; the sale price was $103k; appraisal price was $113k; the county tax assessment was $105,500.