Steps

1. First download a trainer and make it work
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2. Go to the gta iv main file (Program Files - rockstar games - Grand Theft Auto iv) 

3. Place it in there.

4. Now open the trainer (F3)

5. Go to Object Spawn menu.
 
6. Go to 'Load objects from Objects.ini

7. then go to 'Edit Specefic Objects' and then find the door. it will be transparent when u find it.
If that happen go to 'Make object Dynamic' and now u can walk inside ur house!

7. U will be Teleported to it automatic (u need to unlocked all maps or else u get 6 ****** wanted level.

8 Unlock all maps by going to 'Options'

9. Then click on 'Unlock Maps'

10. Test it

11 Have fun!
