How to improve the material texture of render tiles

Cesium ion
1

Hello team,

I have below query kindly reply me quickly

  1. Hi I would like to make only Burj Khalifa Down town using Cesium ION unity sdk can I do that?

  2. also I saw the youtube video how the city get spawn in to the scene based on latitude and longitude but their texture quality is not good can I make photorealistic texture quality on each building what is streaming.

  3. Last query once the map I will create using Cesium ion all the map will be store inside my project or every time it will be stream from Cesium server?