Plan basic things first
Many builders want to build an apartment building, but when faced with the question of exact planning, they face a hurdle that seems difficult to overcome. In order to keep the effort as low as possible, you should proceed in a structured way when creating the plans; "One by one" would be the right motto here.
Since you probably do not plan your apartment building alone, you need a partner, such as an architect, who will work out the plans with you. When choosing the right partner, you should not disregard the builders, ie the companies of prefabricated or solid houses: The planning and organization by means of a company is often easier, because apart from the company no one is involved in the construction.
As you can see, planning a multi-family dwelling can be done easily if a structure exists to be planned. So do the necessary planning steps in a meaningful and clear order.
Tips & TricksCompare different builders by going there and getting advice on multi-family housing. Personal experiences usually help you better than others' experiences when it comes to making decisions.