Believe it or not, a lot of work goes into real estate projects–in particular, the decision over whether a property should be renovated and refurbished, or demolished outright to make way for another structure. Personally, I much prefer renovation and refurbishment: I find it more cost-effective and efficient, and I’ve made much of my career in the renovate/rehab niche as well.
All the same, there are a lot of factors to consider before you decide one way or another. A lot of these circumstances are local, and specific to the city (or town) where your property is located. This includes zoning ordinances, building costs, and barriers to entry, to name a few.