Company database, right?

Question

Database design

I want to ask if I did it right? and how to implement the last three points can you tell me? or give advice

There is a Сompany and Employees of this Company
The Company could be located in one or several cities, in one or several buildings. The company can occupy the whole building or just a part of a building.
Employees have some Positions in a Company
Employees have a Contract
An Employee can be Promoted periodically
An Employee passes Assessment procedure once a year. As a result of Assessment, he/she could be either promoted or not.
At each Company's location there must be at least one Employee with “Fire-protection safety” role.

Answer 1

is it right?

No.
For example,

Company could be located in one or several cities

, and you have one.
And don't forget about the physics model: the building is in the city, not the other way around.

I don't quite understand why

Correctly:

City (ID, Name), 
Building (ID, City (FK City), Name), 
Location (ID, Building (FK Building), Company (FK Company), Name)

can you help with the last three points?

Maybe my English is bad, but

An Employee passes Assessment procedure once a year.

there is no certainty: is there a certain period of verification or the next verification is not less than a year later.
A model: Person, Position, Contract, Employee, Check.
Yet again

Employees have a Contract

Contract for a person or position?