Is it common to do this type of split investing as a General Partner with limited partners or all as operating officers as an LLC?

Payments that you make normally fall into one of 3 buckets100% of the payment can be factored in somewhere on the returnPartial payment can be factored somewhere on the return0% of the payment can be factored in somewhere on the returnHouse-hacking also has considerable tax implications in the event that you want to sell this property.You can potentially defer a portion or all of the gain on the investment property with 1031 exclusion.You can potentially exclude a portion or all of the gain on the personal residence with section 121 exclusion

Payments that you make normally fall into one of 3 buckets100% of the payment can be factored in somewhere on the returnPartial payment can be factored somewhere on the return0% of the payment can be factored in somewhere on the returnHouse-hacking also has considerable tax implications in the event that you want to sell this property.You can potentially defer a portion or all of the gain on the investment property with 1031 exclusion.You can potentially exclude a portion or all of the gain on the personal residence with section 121 exclusion

Obviously you have money coming in but the ability to get most or all of your money out of a deal will allow you to scale quickly use that money and your 75k each month to do a couple at a time.

Pay off some or all of the debt and look for another owner occupied house (not the one where your mom lives).  

Is this on the REO side, short sale side, bank side or all sides?

* polybutelene pipes in most or all fixtures*upstairs baths dated vinyl/shabby vanitiesProposed changes/repairs: (please propose order for this list for convenience of construction!)

as to how much for the 2 or all 4 lots; once I have that I can see if between the two realtors and myself if we can agree on who pays how much to buy the lots. 

We are not sure if it would be best to have each SFH with it's own URL / web site address, Or all SFH under one web site. 

I'm assuming you based on the fact you said no monies have exchanged hands but it's good to be concise here.Your squatters could gain legitimate tenant rights if they claim they have a written, oral or implied rental contract with you.