(S (S (S (BASENP (EX There)) (VP (VP (VBP are) (ADVP (RB also))) (NP (NNS concerns) (SBAR (IN that) (S (NP (BASENP (DT a) (JJ four-story) (NN building)) (PP (NP (QP (ADVP (RBR less) (IN than)) (DT a)) (NN metre)) (PP (IN from) (NP (BASENP (DT the) (NN edge)) (PP (IN of) (BASENP (DT the) (NN hole))))))) (VP (MD may) (VP (VB collapse)))))))) (SBAR (IN as) (S (NP (BASENP (DT the) (NN earth)) (PP (IN under) (BASENP (DT the) (NN building)))) (VP (VBZ continues) (S (VP (TO to) (VP (VB be) (VP (VBN eroded))))))))) (PERIOD .))