I actually started DCity today, before reading your post, and spent a similar amount of Hive on it. I got up to 100 SIM/day with mostly Gyms and Luxury Homes which I bought from the market. I guess your strategy is a bit more efficient here ;).
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Gyms are not the most SIM efficient buildings out there, but they do offer protection against crime, which may come in handy if your city starts to grow.
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