To approach this from an objective position, look at it as a second home.

I did a custom job with mortise locks where money was no object.

i presume everyone here will say rent, but I need more objective advice and what is my ROI?

I know personally how exhausting it can be to commit to the daily objectives and to put service before oneself.

With all of the possible objections mentioned above, it seems simpler to just pass on the whole thing....just my .02.

Dan what is your investment objective and time horizon?

I've chased a lot of shiny objects over the years and it usually did not create the wealth or enjoyment I expected.

They are radiant heat, so they heat the room and objects much like the sun does.  

Whilst it's commendable and right that you are concerned about tenant relations, any tenants that object to paying market rents in an improved building are not really tenants you really want to keep.

Use that number for your underwriting to see if it would still allow you to hit your objectives.