Platform: Android.

How much it will cost separately, coded template and graphics (for example, i can use graphic from unity asset store)?

Well I just did a quick search on the Unity asset store and there are at least five "city builder" projects for sale.  Go and take a look.

I saw, prices about 400-500$ max. It's a little different from 6 digits money.

3 hours ago, qwaqwe said:

I saw, prices about 400-500$ max. It's a little different from 6 digits money.

Its not the same as contracting a team (outsource company) to develop something for you.  So obviously it will be a different price.  But anyway do any of those suit your needs?

Yes, it can be helpful, but need to dive into code and make customization.

Isn't that what you wanted?

This one is like what i need

https://www.assetstore.unity3d.com/en/#!/content/16832

So about $600, not bad.

Have you seen this one: https://www.assetstore.unity3d.com/en/#!/content/61716

Anyway good luck.