This paper presents the IULA Spanish LSP Treebank, an open-source treebank of over 40,000 sentences, developed in the framework of the European project METANET4U. The IULA Spanish LSP Treebank is the first technical corpus of Spanish annotated at surface syntactic level, following the dependency grammar theory. We present the method we used to create the resource and the linguistic annotations that the treebank provides, using examples and comparing with similar resources. We also provide the statistics of the treebank and the evaluation results.