The number of stores required for the new city is 2000 / 2 = <<2000/2=1000>>1000 stores.
The number of hospitals required for the new city is 2* 500 = <<2*500=1000>>1000 hospitals.
The number of schools required for the new city is 200 - 50 = <<200-50=150>>150 schools.
The number of police stations required for the new city is 20+5 = <<20+5=25>>25 police stations.
The total number of buildings required for this new city project 1000+1000+150+25=<<1000+1000+150+25=2175>>2175 buildings.
#### 2175