Type of construction materials for the build(block/metal frame/wood frame), separate utilities, finishes, tech, cleaning crews, any tips and tricks would be HUGE! 

Your fixed costs could be something like the following: $5k property tax, $2k insurance, $3k utility (including internet and TV), $2k landscaping (mowing, weeding), $2k or $3k maintenance (if you have a pool or hot tub). 

What is the flooring material?

The latter would create mortgage rates issues, the former will eliminate a lot of fake demand and some material real demand in the housing market that is bid side.Mortgage rates higher + build costs higher(less labor + tariffs)= Kill demand.

Focus on tax-saving strategies such as cost segregation studies and bonus depreciation to accelerate deductions.By qualifying as a Real Estate Professional (spending 750+ hours annually and materially participating), you can offset your wife’s S-Corp income with real estate losses, reducing your tax liability.

Second, for you as a taxpayer you need to evaluate if your tax situation (e.g. property type, tax profile, material participation, etc.) will allow you to leverage additional losses generate from cost seg to optimize your taxes. 

What is the speed of the internet, is it hot water (international property holders), is it AC.These basic clear descriptive items are great because if the price is fair and it clearly states the benefits.

As others have stated, your fit & finish goals should be guided by whether you plan to:1) Rent: tenants don't always take care of a property, so you want to use lower-grade materials and workmanship.2) Flip: higher quality on workmanship and materials is usually required.Regardless, you always want to "Maintain to the Neighborhood".

I came up with $385,000 to build for material/labor.

Perhaps because they know people will do a simple internet search and see the *****torm that's brewing?