@Dawn Anastasi has a contractor list on her website and I would trust her recommendations.

Other contractors that attend meetings and a ton of vendors at most monthly MAREI meetings that have their own list of referrable contractors - but most of these Vendors are not on BP, so you can't get any input from there here.For example - we have 7 different hard money lenders with a huge list of vendors they refer, 2 Title companies, a Cabinet Flooring Guy, 3 Property Managers, several wholesalers, and some companies that specialize in water and other damaged homes.Hope to see you at a future MAREI meeting.

Do you have any references for either and/or have you used either other before?

*legal disclaimer I am not an attorney and you will want to talk to one*.. but this is from the irs website on 1031's Both properties must be similar enough to qualify as "like-kind."

I do and their website isn't working for me right now.

And I've never seen a 4 plex referred to as an apartment complex in "small town Iowa". 

I was referred to BiggerPockets by one of my investors a few months ago.

Hey - if you didn’t have an answer yet this is likely in reference to a local county zoning tax code and may or may not have anything to do with zoning.

I used a website to get me estimates on rents in the area.

I have some in mind, but always checking recommendations from the BP community is a great reference.