The recent decision by Alphabet to scrap its ambitious waterfront regeneration project in Toronto is a landmark in the short history of smart cities.

In June 2000 my regular column in Planning reflected on design quality in German towns, the Blair Gpovernment's Urban Task Force, and ways in which predictive text created bizarre proposals in students' work.

Guest blogger, the distinguished Hungarian researcher and consultant, Iván Tosics, reflects on radical alternatives to address today's urban challenges.

Gentrification is an issue in cities across the world, but urban planning systems are ill-equipped to deal with it.

Here in UK, and particularly in the North of England, museums and public galleries are being closed down as councils struggle to cope with real reductions in income forced by the UK government's austerity programme. In USA it is a different story.

Twenty years ago I became RTPI President. Here is the text of the speech I gave to RTPI Council on my inauguration. It ends by reaffirming the manifesto published in 1975 by the Radical Institute Group, of which I was one of the founders.

This blog was first posted on the Planning Resource website on 27 June 2012.

The Rio +20 summit was widely ignored by the world’s political leaders – the clearest possible statement that they have no intention of providing leadership on sustainable development. Similarly, the media devoted scant attention to the event – in marked contrast to the coverage given to the landmark 1992 gathering, or the 1972 summit in Stockholm. So what actually happened at Rio and where does it leave planners and others whose work it is to deliver more sustainable forms of development?

Whether it's an old church or the shell of a derelict factory, a gap site or an under-used parking lot, vacant land and buildings are a headache for planners and regeneration professionals. The impacts of vacany stretch beyond the site, creating a sense of decline and blighting neighbourhoods. Yet these left overs can be the ingredients of a new urban stew. Potentially they offer opportunities for cheap premises and new start-ups, innovation and regeneration. The key questions are how do you make the connections to unlock that potential, how does the planning system handle temporary uses, and how can initial success be sustained?

This blog was first published on the Planning Resource website on 7 March 2012.

The use of major sporting events to drive development and regeneration has become increasingly controversial. Who gains? Who loses? Since the 1992 Olympics in Barcelona such spectacles have been widely seen as offering a unique opportunity to rebrand places and upgrade problematic sites. However, the planning of such infrastructure typically displaces poor and marginalised residents and small businesses. The Centre on Housing Rights and Evictions estimated in 2007 that globally millions of people had suffered forced removal as a result of development for sporting and other mega events. Are such outcomes justified in the wider public interest?

The Barcelona Olympics created new expectations about the role of sports events in regneration. Photo courtesy of Tom Bendall.