Most of the buildings in the neighborhood were empty and collapsing. Renovating the dilapidated building and infrastructure and bringing in new tenants is what seems to have had the biggest impact.
Is this the basis of your statement?
> Wilbur Worthen, a mentally-ill 56-year-old whom Gray had befriended, burst into his office at the Drop Inn Center and shot him to death with a .357 magnum.
The Drop Inn Center is a homeless shelter. Buddy Gray was shot by a person he had previously helped at the shelter.
No, the basis of my statement is the lengthy sections of the article describing Gray's political power and obstructionism which was causing the district to decay and how his death lead to a vacuum in which the gentrification could happen. Describing it as execution was just gallows humor. They could also be bought off with grants.