Add a cast iron or aluminum fence around the pool for safety and charge rent high enough to include a pool company to maintain...maybe, I do not have a rental with a pool (above is our pool) but I could see it being quite a plus if safe and easy for tenants.

If just fin and tube baseboard get a basic a cast iron boiler from say weil mclain.  

Am I going to replace the cast iron plumbing even though it isn't leaking?

Also, love how this site is set up with pod cast, and all the wealth that is on here!

Cast Iron has a 100 year life span and this property got 30 years on top of that!

And know that mixing business with friends is a great on one hand, but can cast a shadow as well.

At the same time listen to pod casts every time you are in the car or on the train. 

When you say PVC stocks, are you referring to if the piping in general is made of PCV instead of cast iron?

Keep reading books and listening to the pod cast.

I have, however, been listening to pod casts and reading and learning all that time.