Take an air compressor and generator,  put the generator outdoors, hook up the compressor to the boiler, turn compressor on and listen for air rushing out of any breaks. 

Wondering if I will have any resistance to paying through an APP

@Mindy JensenPlus being here In the below zero freezing degree weather in Ohio, seeing @Brandon Turner sunny Hawaiian tan inspires me 😂

After phase one is 80% full we will have good cash flow (around a 13% cap rate) Phase 2 is outdoor units and RV/boat cover parking after phase 2 is 80% we will have really good cash flow with a cap at around 15-17%.As for a demand/feasibility study I did not.

My market likes cool, but we're hot weather 10 months out of the year. 

The reason is artic weather.

Hard to say, but we know San Diego is a supply constrained market with strong population and employment growth prospects in a great weather climate (with long term climate migration something to be considered) where it is VERY hard to build new apartment units and those that do get built are top of market Class A units so buying C and making them B+ in A areas is a proven model in SD.

The weather, and the price of properties is significantly less than Colorado or california where I was prior for the last 4 years.

Partnerships legally formed in the US are generally not foreign persons, so I'm not surprised your seller is resisting filing any forms or agreeing to withhold.

I live in Wisconsin so I understand your pain when dealing with this cold weather.