While this may all be one project, on one site, for one Arch., you have three different bldgs. with three different layouts and framing arrangements. Maybe different soils conditions in separate bldgs. and different foundations because of that, and this might be over and above that caused by the different framing conditions. Then the darn club house is way up in North Texas; Oh... maybe you mean the whole project is in North Texas. I don’t see any repetition there, you are responsible for two different bldgs., each with different unit types, and other associated spaces; plus a third bldg. which will be completely different than the habitable multi unit bldgs. You shouldn’t be thinking in terms of only two unit types or charging on that basis. To carry that thinking to its extreme, a 180 unit bldg. with only one unit type would cost less for the engineering. Tell the Arch. if he wants a really good price to check with Costco, Wal-Mart, or one of the big box lumber sellers, maybe they have a deck software which can be applied to this job.