Relationships and modelling data

I have a problem with modelling Data-tables :

Table One :   Buildings (Definition of houses) 

                      Column :  Building_ID  120

                                       Building_ID  140

                                       Building_ID  250

Table Two:     Offices and rooms in Buildings

                       Columns:  Office_Building_ID  120 and Office_No_ID  01 (like for Wprkingroom)

                                        Office_Building_ID  120 and Office-NO_ID  02 (like for Meetingroom)  

                                        Office_Building_ID  120  and Office_No_ID  03 (like Cafeteria)

                                        Office_Building_ID  140  and Office_No_ID  01 (like for Workingroom)

                                        Office_Building_ID   140  and Office_No_ID  02 (like for Meetingroom)

                                         Office_Building_ID  140  and Office_No_ID  03 (like for Cafeteria)

Table Three:   Cost-Records

                       Columns:   Cost_Buidling_ID  120  and Cost_Office_ID  01 

                                         Cost_Buidling_ID 140 and Cost_Office_ID 02

therefore: I need two Key element to connect. And I do not know which is correct and possible. What must I do ?

with tableau there is no problem : I define 2 Keys in relationship.  But I will work with power BI and think its better tool.

Please help. thanks and kind regards uli