Rehabbing for a million dollar sale

[Erin N.]

I bought a foreclosure in a million dollar neighborhood.  I live there and rent out the guest apartments and part of the main house.  In the next few months, we're going to start the process of renovating the place so we can sell it for top dollar.  I've always been a rather frugal person, and all of our renovations so far have been BRRRs.  My point being that I'm sort of a fish out of water when it comes to high end finishes and what people who buy million dollar homes look for.  I'm in Northeast Florida in a beach community if that helps.  

For anyone whose niche is flipping higher end properties like this, what do buyers look for?  What are absolute must haves?  To give you some basics, the main house has 4 bedrooms with a really nice sized master suite (1000sqft) - has its own florida room overlooking the pool and its own office.  Main house is 4000sqft.  Guest house is 900sqft and has 2 one bedroom apartments.  Total land is about 1.25 acres.  One mile from the ocean.  

Thanks!