Looking to develop .5 acres into a multi-family property

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Hi Everyone, I’m looking at some land in a town nearby me to build a multi family property on. It already has the right zoning, so that’s a plus. Roughly about .5 acres. What would be the most cost effective way to build as many possible units?(townhouses, apartment building, first floor living complex) The area is a B+ blue collar town. Also, does anyone have any idea where to get building plans for something like this? The good multi family properties in my area rarely come up for sale, so I’m exploring other options.