Multi-unit precon to condo conversion

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I was recently at a seminar where the company was selling 3s and 4s. At some point a question was raised on condo converting these things, as based on the description, there seemed to be no reason why they couldn't be broken up. The company said that they would not allow any buyers to do condo conversion as part of the contract.

Now I do not know what kind of language was in these thin contract to supposedly prevent this, but would it be possible for a builder to block this when the city would normally approve it? This was in Texas.