I have extensive property management experience focused in Multi-Family apartments including student focused housing.

I am conducting research in a few markets to purchase a buy & hold single-family home & need a reliable source for rental data.  

Any advice on what custodian to open it with for ease in conducting RE transactions, fee structure, etc? 

You might be able to negotiate an extension to the inspection period with them explaining the situation (I've done this before and noted it here http://www.biggerpockets.com/forums/93/topics/138828-stupid-newbie-question-time ) but I would generally not advise it as a rule. 

Rewiring shouldn't take weeks, but will be costly and extensive. 

Mine is already past his cutoff date, so you may have little choice buy to file for extensions for the LLC and for both members.

I'd think you mean not to conduct commercial activities that are in violation of any zoning restriction or allow public commerce to be conducted on premises.The tenant agrees to maintain the leased premises in compliance with all regulatory requirements, ordinances and laws as applicable.

. :)BTW, that loophole thinking, I can manage a property for you with a power of attorney, that will get past the license requirement for one party being served, it won't fly if I'm conducting business as a property manager.

How extensive are the repairs you're doing before selling?

Require payment of a non-refundable per diem amount in order to get an extension on the closing date - especially if you had other buyers who would have closed sooner or if you have a high carrying cost to pay while closing is extended.