If you are using unfinished flooring your base will be marked up from the sanders, edgers and you may get some unintentional poly splash when coating. also if there is existing hardwood that will be refinished cover it before you paint and careful with the demo guys removing carpet.

I actually ended up helping demo a bit and carrying sheetrock and supplies to the second floor. then we had a conversation about various things so it was a good experience

Its not cheap to have a property demoed in Detroit, Ex.  2100 sf , two story, between two existing homes will cost approx. 13k, without asbestos and lead remediation - it will take 60-90 days to get utilities terminated, and proper permits issued.

Get the ARB done during demo and still have a long time to get the windows done.  

Problem is demoing out plaster and lath is so time consuming and expensive, and then you have stud walls that need to be shimmed because they didn't bother making them straight when it was going to be plastered.

If you're flipping the property I'd demo and rebuild the floor to modern standards with new materials. 

If you are buying a rental in which a few drawers are damaged or missing but the rest of the cabinets are in good shape you can have a local customer cabinet maker recreate to match what you have thus saving you from having to demo the whole kitchen.Its always best to find in stock cabinets for quicker turn around but if you are doing a high end property as flip best to get designed with a custom cabinet maker or someplace like 1800 cabinets. 

Great deal figure out costs for full remodelOrGut and demo and sell as fixer probably make just as much

When the previous owner didn’t treat the issue as mandated by the city the ordered & completed the demo

@Wei Jie Yang - mortgage lenders are typically the best option in my opinion.