Patching and Plastering - Mold and patching

I live in an old Brooklyn brownstone. Interior walls are lathe and plaster, exterior ? and masonry. Several years ago, after a snow storm, one of the downspouts clogged and the melt accumulating on the roof must have rose above the flashing. I ended up with a waterfall on a section of bedroom wall. The repair wasn't done very well and now I have paint peeling back, cracks at the corner of the wall and some kind of white mold growing under the lifting paint chips.

I don't trust the landlord's hired help and would like to do it myself...the correct way. It's just two small sections of an outer wall with a window in the center and separated from the rest of that wall by a break formed by the chimney stack:

14" x 112" and 12" x 57"

I've rapped my knuckles on the wall in several spots and it all feels solid, like concrete. I assume that I only need to remove paint and plaster and not go down to the brick. Once I remove all loose paint and plaster, any special treatment for mold? Bleach? What would you recommend for filling any holes and smoothing the surface? Does it make a difference that it is an outside wall? What about primer and any other prepping considerations before painting? Recommendations?

Thanks.

Talk to your landlord. Making repairs without his permission is a good way to get in trouble.

Furthermore, it probably isn't mold but effloresense. If it is a white, feathery crystaline substance it is caused by the water leaching minerals to the surface. The proper repair is first to neutralize that substance with a vinegar solution then perform the repairs.

Repairs will probably not be permanent until all water infiltration is stopped and that happens from the outside.

I would let the owner deal with it.

I'm the type of person who tends to do my own troubleshooting and repairs, but this time I'll let him deal with the headache. Thanks for the advice.