Office Condo Development and Taxes

[AP Horvath]

I am doing the math on an investment into a developing office-condo project. They have started selling units but haven't broken ground yet. 

I asked the listing broker about taxes and they replied:

"Since they will be deeded as condos you will pay the taxes as assessed by the county"

Unless I am misunderstanding something, they are asking me to consider purchasing without knowing what my tax bill will be. Is that right? That doesn't seem to make sense.

Thoughts?