Investor-Friendly in-fill and MF builders in Houston?

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Looking for insight from those with real-world experience working with builders on in-fill lots or multifamily in Houston. A bit above builder-grade (definitely not Luxury). What are your average costs to build per sq/ft and what is your typical time frame? Does more sq/footage reduce the cost per sq/ft? Also, how involved are you in the building process? Finally, aside from the cost of the lot, is the cost all-inclusive with the builder (i.e. Foundation up)?