Need an attorney to place offer in Ohio?

[Minka Sha]

Hi, 

Looking to place an offer on a 5-unit building in Ohio. The realtor we are working with wrote a Letter of Intent and the seller's attorney replied with a few pages of text "addendum. The seller's attorney offered to write a purchase agreement; however, my realtor recommends to work with an attorney to write an offer.

Is it normal to hire an attorney to write a purchase agreement in Ohio? Where I'm in CA, it's just purchase agreements, and communications through the counter offers. It seems strange to hire an attorney to just write 1 offer - what if it's not accepted, I'm out few hundred bucks

Thanks in advance!