your APS processing looks good. After that, you have to process more points to get denser results. You can do it either in the MISP or in the GAR (Graph Analysis and Refinement) modules.
Options that you can try in case you cannot get results in your are of interest:
+ using a non-linear model for the deformation (input the number 5 in the smart box)
+ process temporary scatterers (on-off option in amplitude processing and after that amplitude as weight)
In any case, to investigate your buildings of interest, I suggest you to use the small area module.
You can also use the visualization tools in the classification module to better and deeper investigate your data (time series of amplitude/coherence)