Today I made it a point to go by this building that the OP mentioned. Since I live not too far away and I had the day off, I went to do some shopping around the neighborhood and walked from the plaza del Congreso to Pichincha 700. It's actually a very nice block, no abandoned properties, no squatters and a lot of new construction (some of it looks high end) right at the end of the block on Av. Independencia. Some very nice businesses around there as well, some cute restaurants, and of course a huge COTO that not only sells foods, but appliances and electronics. Balvanera, still has a long way to go to be a prime neighborhood, but if you want a (still) affordable and VERY convenient neighborhood to live in, this is it. There aren't many neighborhoods that are this central and affordable left in Capital Federal. I still wouldn't walk around at night, I don't think a lot of people do, and I would be extra vigilant about my personal and home security as some of the surrounding blocks have several empty lots and abandoned / squatter occupied properties. And if I was coming home after 9PM especially in business attire I would take a taxi.