She did the remodel and put in a deep kitchen sink and a disposer, and the disposer outlet is too high in relation to the drain's wall connection, so the disposer is always half filled with water. 

With the kitchen on the other side the formerly exterior wall, there should be a 2" drain line and stack available already.

I have 2 houses I have owned almost 25 years on well and septic , I have replaced the well pump once ( $ 500.00 ) and reworked drain fields 1 time ( $ 1500 )   I did both myself ( friends in the trades pulled permits)   

I have found sewer lines that were draining the wrong direction on a new home build just before the slab was poured.

It'll be owner occupied.So here's the poop:150y/o brick 3 story. 2000 sq'Needs: New roofpartial gut8 new windows (4 "historic" inserts)9 repaired windows2 new exterior doors and 1 rotted sill replacement.all new plumbing (3 baths 1/2, full, 3/4)mostly new electric (if only to sleep better)new furnace (though there are two on premises)A/Csome refinished floors, some carpetnew kitcheninsulationframingdrywallWe'll also want to deal with a concrete patio that's draining water toward the foundation before it causes problems.The place is in a transitional neighborhood (i.e 1 block away $300k homes and $150-275K condos, but plenty of ratty joints too).

A copper main water line is likely to be more expensive for the pipe costs than drain line.I would expect your costs to also include tap fees to the city.

I'm a newbie investor - selling my first rental (one horror story) and my first rehab ( another horror story, though it came out ok but drained me fiscally nonetheless, and I am facing financial ruin if these two don't sell quickly).

It is really an entire weekend of work, and it can be draining.

What do you call yourself besides "Real Estate Investor".It is sad to know, that 1) We are grouped with Realtors, 2) What we do seems so easy, yet it is very difficult, 3) I haven't yet to get a lot of respect for my decision for leaving my stable corporate, mind and spirit draining job.Love to hear what you all have to say...

window units per apartment you have now.Adding W/D connections in each one is going to involve permits, licensed plumbers and probably some pretty extensive plumbing on both the intake and drain side.