Once the upgrades go in, we are looking at modernizing and maximizing on the return.

New and Modern is based out of New Jersey and is a 100% commission brokerage for just $100/mo. 

That said, it sounds like the OP and their team have already been trying for months with many hours on the phone trying to resolve the issue the old fashioned way, and they aren't getting anywhere.

Ideally, both kinds of buyers are able and willing to pay a premium price, hopefully in a cash-only deal, for their urban oasis in Spain (whether it'll be their main or second residence), as long as it's modern and ready to live in, which saves them the hassle to renovate it themselves.

Taking the primary residence from a 3 to a 4 bedroom, adding HVAC, new open floor plan, modern kitchen and bathrooms as as well as adding massive walk in closets in two of the four bedrooms.

It is to create an easier path for a consumer that has been screwed over in some fashion.

Buy, refinish the floor, spiff up but don't modernize, then trot on down to the Huntington Collection and furnish with quality, durable antiques.The niche market I'd target is rich parents of out of state child actors coming out for auditions.

@Patricia Andriolo-BullI also like a clean light interior, with black - which makes it feel grounded and modern. 

This is the Old West End, a historical district in Toledo that has a very strict HOA/Historical Protection group that basically forbids you to use most modern building materials.

That's generally fee's of some form or fashion used in a manner that views as invested capital.