They are really building this area up. There is no more open space.
•They built up the area over the years.
2. Fig. to develop, accumulate, or increase something, such as wealth, business, goodwill, etc. •I built this business up through hard work and hope.
•She built up a good business over the years.
3. Fig. to praise or exalt something; to exaggerate the virtues of something. •The master of ceremonies built the act up so much that everyone was disappointed when they saw it.
•He built up the act too much.