Anything that constitutes a major inconvenience to the tenant, such that a reasonable court would find one negligent for not addressing quickly, constitutes an urgent maintenance need.Example of the former: leaking water, gas, exposed live electrical wires, smoking in electrical panel, dangerous leaning tree, etc.Example of the latter: poor heat performance of heating system; clogged gutters overflowing causing basement dampness; etc. 

Put in any offer, even if you know it won't be accepted, it will get you used to your systems, and learn negotiating skills for the real deal!

Typical guru always comes back with claims of a room full of attorneys blessing their system or product and denying any unethical or illegal aspects.  

The difficulty really depends upon how the heating system was installed from the get go.  

I wish that I could trust and believe in there system but in the end I have to go with my gut!

Some are more expensive than others (HOA) fees, some have central water and sewers while others have well and septic systems; most all have recreational facilities; you will find a wide range of prices, dues and taxes.  

I use a system for my flooring and types of things that I do to my rentals.  

The East Bay is where most of the gentrification in the Bay is happening, with the rapid-transit system, BART, being the main engine of growth for people who want a quick commute into their jobs in San Francisco.

Having to do an engineered system is usually a deal buster as they are very expensive

These homes will require a new kitchen, HVAC system, and finishes.I'm assuming on these properties I will be required to get a construction loan.