I think it will be a fairly quick process but not sure about the upkeep.

I did some basic cleaning, the structure was in reasonably good shape, and the grounds needed some basic upkeep.

The weight of the contents most likely had much to do with the failure, as it appeared the integrity of the box was compromised by the base pulling out of the groove in the frame and distorting due to weight.  

It's like a weight off my shoulder.

For the bedroom count in question, I grab the low, high, and average $/square foot for the past 3 months, and apply that rate to the square footage of the new/vacant property, to get to an average to weight 25%.I base 15% of my calculation on the average market rent for the bedroom count in my target neighborhood.

He had become tired of the upkeep and work involved.

A lot of upkeep and management??

A house that's 100+ years old will very likely have structural, foundation, plumbing and electrical problems or at least will require higher upkeep of these systems. 

., Vacation Rental property, and most recently Senior Living home for active seniors that want to live in nice setting, but don't want upkeep or expense of their own home. 

Income CapitalizationThe appraiser will then weight the values derived at by the various valuation approaches according to data availability and his/her local market expertise.