She again worked with the tenants next door and their landlord to get it removed and disposed of as we can't have rotting animals in the backyard in the middle of the city, honestly I don't even know how that would have ended up there. 

Sure the shingles run a bit over $100 a sq , but you need felt paper , drip edge , flashing , coil nails , misc supplies , delivery , disposal costs , labor , insurance , sales commissions , overhead , whats left is profit , and it it runs around 20% . 

Also figure disposal costs (mattresses especially) and I am going to guess your stairs need repainting (maybe dark blue or brown treads this time) that is not normal wear and tear. 

If it is not removed in twenty four hours, Landlord will remove and dispose of it.

I need to fix the garage, garbage disposal, and there's possibly mold in the attic (don't know how true this is since the guy who cleared my vents was getting me to purchase his service for $2k).

Regarding if you should DIY manage or hire a PMC:Many new investors read a couple of posts and then think self-managing their rental property, and avoiding PMC charges, is an easy way to boost their ROI.The reality, is that many of these investors really haven’t taken the time to properly understand what it takes to properly manage a rental property and the corresponding tenants.Here’s a list of some of the requirements to properly manage a rental property:Knowledge of all local municipality, state and federal landlord requirementsIntimate knowledge of all Fair Housing statutesUnderstand all federal privacy laws, as they’ll be handling social security numbers and IDsProper business insurance in the event their computer is hacked and or they improperly dispose of tenant data.Where to advertise their rental, other than ZillowWriting ads compliant with Fair Housing statutesCreating a process to accept calls/texts and schedule prospects to show their rentalA rental application and application fees that meet all local and state requirementsKnowing how to screen applicants to avoid professional tenants and the growing amount of fraudulent dataA lease compliant with all local, state & federal lawsUnderstanding local and state requirements regarding security deposit collection and holdingRent acceptance options for tenants and accounting system to track, including late fees, etc.Plans to handle nonpayment of rent issuesKnowledge of their local eviction laws or access to an attorney familiar with evictionsHow to accept, track and respond to tenant maintenance issuesBuilding a list of handymen and contractors for maintenance and turns between tenantsExpertise at evaluating tenant damages to charge against security deposit when tenants move outResearching local utility requirements to avoid suspension of services that could lead to frozen pipes or flooded basements, etc.

I'd recommend pushing density to 3 or 4 they all finance the same. we picked 3 because of the 35' height allowance in our area. here is a rendering to help paint the picture. our target appraisal value is 550k on the first few and pushing them to more than 600k as we sell some or keep them but if you are the only one building multifamily it's important to highlight the importance of appraisal and selling or disposing of some assets to create comparable to be used. our market has very little 2-4 units built because of economies of scale we are the only builder doing this style and we control the full process and it is a high barrier to entry where we are at. we are able to build at a lower cost now than almost buying a duplex because they are so small. each one is 668 sq ft total of 2004 sq ft. 

If someone is working with a lower balance of funds like I am, than I'm more likely to prefer cashflow so that I can continue to afford the property as well as my life style.If I had some disposable income that was in excess of what I need to live on, than I'm more inclined to look forward towards appreciation because I would have enough wealth to take the hit now for the bigger payment in the future. 

When they say 1% each for acquisition, management, and disposal, what is that 1% of?

Investors - I have 25+ years of public accounting experience in the real estate space at your disposal.