The building superintendents say he had a moving truck over there and had booked the elevator. 

You can get sued and lose the house to the tenant if their kid has elevated levels. so they have what's called "Post Compliance" inspections to make sure it's still in compliance and there's no new hazards. 

depends on the demographics.If its a retirement neighborhood, lots of elderly people some may find it a tripping hazard or a pain for walkers, wheel chairs etc...Down here in south Florida many older folks would not buy two story homes because of having to trek up and down, and we have lots of older folks.Sometimes the elevation difference can be partially minimized visually by using creative threshold transition pieces.

If you go with VCT over 3/4" plywood, you will add just a hair under an inch of elevation to whatever you put it on.

Restrictions related to Elevation, zoning, power, water, sewer, etc).

Regarding the tenant's use of the A\C Jimmy Devenport posted a link to the Owner/Tenant Act in NM Section 47-8-22 "E. use in a reasonable manner all electrical, plumbing, sanitary, heating, ventilation, air conditioning and other facilities and appliances including elevators, if any, in the premises"If the A\C repair person is stating that the tenant is operating the A\C in a manner that it is not designed for than I would think this is Not a reasonable manner. 

It may be an ok price if he is cracking in to make a second pit and pump and hard piping it out separately or with the current outflow...I am not sure if you are planning to drop in the battery powered pump when power goes out (which seems odd if you were away, defeats purpose) or if he has a second pump put in  and it is on standby (maybe by elevation or overflow, I am not a plumber..

First thing I want is the return of my money, then we can talk about the return on my money.Getting private money will never come from an elevator pitch (unless you're on TV).

Lawyers are now suing over elevated blood tests that were 20 years old.

Say 220 was roofing ststems for expenses, 221 could be felt, 222, shingles, 223, hardware (nails, screws, trim, drip trim, vents, sofit) 224, decking/lumber, 225, roll roofing (including rubber systems) 226, glue/adhesives...you get the idea.If you are knocking out say 4 basic floor plans, different elevation but all the same materials/grades, you are buying bulk and allocating costs based on the plans per plan.