I only buy those with a detectable float switch mechanism for that reason.

What ratios, mechanisms, or philosophy drives your cash allocation decisions?  

Can you suggest the mechanics of an equitable deal to buy out the partner?

Some examples of habitability codes are functional toilets, functional sinks, functional smoke detectors and carbon monoxide alarms, weathertight windows and doors leading outside, bathrooms must have a mechanical vent or an easily opened window, a bedroom must have an easily opened window and either two electrical outlets or one electrical outlet and a light fixture and all pipes, plumbing and electrical must be per code.

Is there another mechanism whereby I can claim the rent for the unpaid months and the cost of repairs and cleaning and leave a negative note on her credit and rental record if she does not pay?

Another contractor said cheapest and best option is to do gas wall hung boilers (instant hot water) and baseboard radiators in all 3 units, all mechanicals located witin the units.

When it comes to items that I can get replaced fairly easy I usually wait until they break, I have found many instances that various mechanical items last much longer than expected.

I never knew all the back end detail that goes into all of this. i have done a lot of research on the active mechanics of all of this but never the paperwork involved.

The other mechanical and structural ones are mostly known quantities.  

Once we got going on the rehab, we realized that they don't make parts for the window mechanism anymore (company went out of business).