@Alex Nicholson for broken items, it's best to get STR insurance from Proper or CBIZ so you don't have to deal with Airbnb.

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. - If it's a partnership then that requires a lot more information if anyone's going to give any advice on what to do here.If they're only providing labor and GC (management), then half equity in the flip could be fair compensation.I need more info to give any kind of proper advice

You also may want to give some consideration to zoning if in San Diego proper. 

I am a builder investor out of the Houston area. We went out and pulled two appraisals, one by me and didn’t share in the beginning because I didn’t want my appraisal to be bias. The clients bank (buyer) went out and ...

The only requirements I have is that the pool is closed by a certified pool company - this way I know that it is insured and properly closed so pipes don't burst during the winder.

Assuming that you have a properly formed contract, the short answer is that they can refuse to perform, but there will be consequences.Those consequences normally play out in court, so it's not normally worth the cost to pursue it. 

@Kushaal Malde sorry it wasn't allowing me to properly tag you...see above reponse.

yes these already have fenced private small backyard  As the units them selve are small ( 600 sq ft each ) I am trying to extend the washer dryer with some shade and proper flooring instead of the washer dryer just out in the open with hookups .

According to my reading of that lease if the tenant gave proper 10 days notice and the rent was UTD then he/she is entitled to the deposit.