Some investors know block by block which places not to invest in.

That's not to say you can't do well there, but I'd encourage you to look at Belton and Temple (which can also be very rough and block to block) rather than Killeen.The good news is that there continues to be serious population and job growth in the area.  

We found out the potentially the whole block has led pipes so we are needing a contractor to cut a hole in the floor.   

As a wholesaler, a seller approached me with a 48 unit apartment complex, 7 duplexes and a 2500 sqft Single family that he wants to sell (all of which occupy the same block.) 

So I am not completely sure but maybe it is because it was blocked for so long.

I also have learned Memphis can be quite spotty (a dangerous block can be just a couple blocks from a good renting location so you really need a boots on the ground agent/team that you can trust). 

This sewer line runs under 2 of the other subdivided lots that were intended to have houses on them about 400' away and ties into a city main 1 block away from the houseOct 2008 - I purchase the home and everything is great, assuming all is per plan.2010 - Developer sells one of the lots that my sewer runs under to the water district for a future clean water well site. 

Neither unit has paid rent and has blocked us from communications.

Block construction cement floors with the floors sloping to a central drain. concrete counter tops stainless kitchen cabinets boob lights and minimum windows by code .

There was also a failing retaining wall in the rear of the property that completely blocked natural light form a handful of houses, and was technically on the property line and a shared responsibility.