The Mayor said in a statement that he is also establishing a housing procurement panel to help public land owners, such as London boroughs and Government departments, to "fast-track the release of their land and avoid the expensive lengthy process they would otherwise have to take on if they acted alone".
The GLA inherited 625 hectares of land following the Localism Act's abolition of the London Development Agency and transfer of powers to the GLA last year. The GLA is now one of the largest owners of public land in London.
The Mayor said that, in the last year, contractual commitments have been entered into for over 100ha of land, with an estimated gross development value of £1 billion.
He said that "substantial progress" has been made in securing development partners for a number of major sites and that "there is commitment" to the implementation of an agreed strategy for all property by 2016.
“London is facing unprecedented demand for housing and public land is one of the most important tools we have in our battle to build more homes," said Johnson.
"However, these sites are useless unless we unlock their massive potential. I want developers to trawl through this new database and bombard us with great ideas on how they can transform these unused pockets of land into exciting new places to live,” he said.
The database has been launched as part of the Mayor's plans to accelerate the number of homes being built in London and to boost the economy.
