We are looking at a site for development that is 30 acres, the seller put a small oil pump jack that is 15' high.

With $600k, I'd be more interested in gas and oil mineral rights and/or a syndication.

BTW head over to amazon.com and type in "synthetic skunk oil" its powerful and it forces vagrants out of a home.

Here is the 1031 requirements from the 1031 Corp website:Examples of like-kind real property that can be exchanged under Section 1031 include vacant land, office buildings, duplexes, apartment buildings, single family homes used as rentals, warehouses, farms, Bed & Breakfasts, 30-year leasehold interests, utility easements, conservation easements, cell tower easements, oil and gas royalties, co-tenancy interests and mineral rights.

I've heard the Zinser shellac based primer does a better job at locking in odors as opposed to Kilz...or make sure it is an oil based Kilz...Here's a link to a BP cat litter flip forum post from a few years back...half way down page 5 he talks about the smell removal process. https://www.biggerpockets.com/forums/88/topics/133059-cat-li...

The two products I'd recommend would be Zinsser's shellac or any interior oil base.

I put in 100K towards repairs, no oil tank issues and sold it for $250K.

After you figure  it out, oil based killz does AMAZING things! 

So, I think the hardest part of wholesaling, with a full-time wholesaling business, is keeping a good team in place as well as having a killer automated and well oiled system in place to handle the volume that is required to scale = make a living (we use Podio and it is AWESOME).  

If you were burning fuel oil or coal or something like that stainless steel would be required but for natural gas you can use either material.