no, but one could rezone commercial areas into residential space. You don’t create living space only by designating new development areas. That is not the cure-all, and in the future it will simply be more necessary to think and plan more creatively. There are many good examples where this works.
As if all this hadn’t already happened – look at the corner buildings in the not-quite-central neighborhoods of cities; often you can still see the bricked-up entrances, the large window fronts of the former storefronts, or the very old, weathered inscriptions on the exterior walls. Today, all converted. But then there’s no longer any pedestrian infrastructure and the residents have to go out to the green fields outside the city for shopping.
Why you’re inserting an imperative here again, I don’t know either. Nothing is necessary, let alone without alternative. You’ve already received answers regarding your ideas about using foreign property. Recently, I saw a great example in the regional program of a deteriorating half-timbered house in a tense downtown location in Lower Saxony. Market value = zero, owner lives in Canada, house stands empty, sale only for utopian sums. Now of course you could try, especially in the case of vacancy, to apply harsher measures. Hamburg is already doing this – in individual cases.
But that can only be part of the solution. The greater part must be a promotion of the price difference between (mid-) old buildings that are not necessarily worth preserving and new buildings. And this can only arise through significantly more offerings in new construction. Only when price pressure arises in the existing housing stock will there be any room at all for creative solutions within the stock. Currently, many people of the younger generations can no longer afford either new or old buildings. Paradoxically, not even the current residents themselves can afford it; the inappropriate price tag was only recently stuck on the nameplate.
What is completely missing, as this discussion shows very well – there is always talk of new development areas. But they mostly have to be new city districts. Just as was still done in earlier times. Planning-wise, of course, a major challenge, but strangely enough it was still possible after the refugee influx in 1950 or with growing population numbers even in the 1970s. It’s probably more a matter of willingness. There are, of course, beacons of this kind, but ultimately this is the task for every medium-sized city in Germany that has experienced significant population growth in the last five years.
A city planner can really have free rein here, good accents can be set and things consolidated and thought of together. Creating future-proof infrastructure. But you would need courage, and a remedy against NIMBYs – they will come anyway. And money, because planning has become infinitely expensive. Just look at the appendices to a development plan in a village. I am pretty sure that biotope mapping and climate analysis, as well as many other things, were not included 30 years ago. And do they advance planning in any usable form?