From what I know about Westchester County in NY, it's quite expensive.I think you need to determine whether you care more about strategy or location because it sounds like you're trying to fit a square peg in a round hole.

If your all-in cost to build for below market value and you are able to place quality tenants, then you should be able to leverage the completed project in a way that allows you to pull out some of your initial investment tax deferred to fund future investments while keeping the rental income and future appreciation.I am a CPA by day and advise many developers on tax strategies.

There is absolutely nothing illegal, unethical, or immoral about utilizing a subject to strategy.  

Until recently I have house hacked. Getting preapproved and then submitting offers. Hoping to acquire duplex or quad this coming year but would be happy with 3/1 or 2/1. Should the process be the same? Since the loans...

Maybe do a tandem approach and depending on your location and price points etc.Nurses mostly get a daily stipend to spend on housing [some have the employing agency pay for the housing] what I found is that even though on average nurses get up to about $180 per day in daily rental stipend - they do not seek out to spend that much and look for cheaper housing - the kicker is it seems that they get to keep the difference of what they do not spend on rent and pocket the difference.So I put my lisitings on Airbnb sometimes as weekly, mostly on as 30 day rental [to keep in compliance with various city, HOA and local laws.So lots of different strategies to go and to keep your options open for all sorts of travelers  that we can not even think of, so expand your criteria.

Could you suggest the best strategies or ways to get off-market deals? 

It's pretty and temping but not the best strategy to pursue.  

So my questions are,1. what are good strategies to SELL your investment properties?

I always look for creative financing options to advance my investing goals.Running the numbers over time is key to understanding what the long term outlook is for this strategy and if it makes sense for each investor.I hope this sparks some ideas on how unique lending options like this may or may not fit your long term investing goals.

Any strategies or insights you're willing to share on finding reliable 100% funding sources?