Corporate Warranty Deed vs. Warranty Deed

[Chase Keller]

Hello, I am in negotiations to buy an apartment complex and the seller's attorney changed the conveyance on my purchase agreement from Warranty Deed to Corporate Warranty Deed.  
I wrote my attorney the same question, waiting to hear back... I have purchased several commercial properties, but I've never heard of this conveyance type.
The seller owns it in an LLC, not an incorporated entity. Is this just splitting hairs on the attorney's end or is this something that I should include in my PAs from now on? Any reason I wouldn't want to have the property transferred this way?

Property is in Iowa, don't know how much this changes state to state.

Thanks for the help!