At this early stage, I’d model a 20% contingency, then consider reducing it once investigative work has exposed the main conditions. Ask contractors to list every exclusion and assumption rather than just describing what is included. I’d want specific answers on panel capacity, kitchen equipment...
The valuation issue should be considered independently. A property can be acceptable to you after inspection yet still fail to support the agreed price for financing purposes.
Is the warehouse inside New York City or elsewhere in New York State? That could affect which local requirements are relevant, so “New York expertise” is too broad by itself. Also, will it be owner-occupied, and can you obtain past utility bills and equipment information? Without those facts...