Initial invest almost €600k?

Hi all, Me and my wife want to open a kids cafe. Architect pre planning is at 90% and we got the initial estimate for cost.

The space is on the ground floor of an appartment building somewhat central in a german city. It is 600sqm (5400sqft) completely empty without estricht ( the concrete that is put in as floor base.

To build all rooms, pour the floor, install ac, build toilets, etc the architect estimates all in about 550k. On top comes the kitchen, countertops and cooling aswell as all furniture and play equipment.

Is it normal that the first renter of such a space has to invest and construct everything? I mean, if in the end it doesnt work out the landlord has half a million in value in his place!? (Of course the next renter wont necessarily need it, but still…)

How did you guys develop a cafe or restaurant? Did you also carry construction cost in this magnitude considering the size?