Any suggestion on the interior design budget?

[Li Lu]

I recently closed a building with 24 residential units and it is more than 100 years old.

I have talked with a designer/architect about interior design.

His quotation is around 21k for all the units.

Is the quotation reasonable?

I remembered I saw one of the posts that said the budget is around $1000 for an apartment.

Please share your experience. 

Much appreciated!