Looking at the 2 car garage apartment (1/1) it will need gutted down to the studs, since it has had water intrusion.

Would it be too intrusive to ask exactly how you got started.

Hey @Benjamin Canyon, did the water intrusion stop altogether?

@Charlie Moore We do a full video walk-thru on every property our clients write an offer on...always starting in the basement or crawl if available...we look atFoundation for signs of deterioration of damage, or signs of water intrusion or settlingHot water tank or boiler...basically just age and general condition hereHVAC/Duct work...age of system and type of duct work...looking for asbestos wrapped joints as well...and possible code issue with gas linesElectric panel- to make sure its updated and there are no obvious issues...Floor joist to make sure none are sagging or crackedExterior we look at all componentsRoof- general age and number of layers if its shingleGutters and downspouts- for damage and drainage...water needs to get away from the house and foundationSoffit/Fascia- for obvious damage or wood rotSiding- general condition and damageWindows and doors- general condition and functionGrading/drainage..porches and sidewalksTree location and possible root damageInteriorGeneral condition of flooring and walls/ceilings for any damage or defectsElectrical fixturesPlumbing- supply and drain lines...as well as condition of fixtures (faucets and shower/bath)Proper ventilation for ranges/stoves/bathrooms with no windowWobbly, leaking or broken toiletsCondition of appliances if availableAtticVentilation through ridge vent or whole house fanRafters/trusses in good shapeRoof decking for signs of damage or water intrusionLevel of insulationHazardous materialsAsbestos Underground storage tanksOh, and make sure the door bell works ;)This is just a first pass before we decide to go for inspection where we'll get more detailed...looking at all this stuff usually takes 15 minutes...pretty easyGlad to chat more...there is a lot not covered here

Moisture intrusion is the worst enemy in housing....

Probably could be done 2 coats in a day and would reduce moisture intrusion by 95% even if done by an amateur.

We have a number of highly intrusive bugs at different times of the year in this area, stink bugs, ladybugs and millipedes to name a few and even during the daytime during ladybug season would be a disaster I would think.

Although, as Account Closed points out, stopping any sources of water intrusion would be the priority.Of course, this is all speculation based on your photos and testimony. 

Again, management of the property to ensure abuse isn't occurring make sense, but external cameras feel very intrusive and uncomfortable. $2000 fee for pet damage, $3000 fee for any smoke damage.

Nick,It's almost impossible to determine from just these few photos but normally cracks in the mortar joints are signs of building shift which could be due to foundation movement or possible water intrusion.