@Saemi Jung just to clarify, are you planning to owner-occupy one unit?

In addition to that, we have 4 fur babies: 2 English Pointers and 2 cats. 

In any room beams, girders, pipes, ducts, furred spaces, or similar obstructions covering not more than 25 percent of the ceiling area may have a clear height of not less than 6 feet (1829 mm).TABLE 1006.3.3(1)STORIES WITH ONE EXIT OR ACCESS TO ONE EXIT FOR R-2, R-3, R-4 AND R-5 OCCUPANCIES STORYOCCUPANCYMAXIMUM NUMBER OF DWELLING UNITS PER STORYMAXIMUM COMMON PATH OF EGRESS TRAVEL DISTANCEFirst story below grade plane; first or second story above grade planeR-2, R-3, R-4, R-54 dwelling units75 feet Third story above grade plane and higherNPNANA

here in Colorado springs we have a hot rental market secondary too low home supply.What is the main difference in driving demand in rental markets between apartments, 4 plexes, and town homes. is there much of a difference in what drives demand fur each of these or are they essentially equivalent in a rental market... ie rentals are rentals?

It is not something that can be avoided if the pet has fur or feathers or dander even if furless. 

This way, they are not selling you jung and overcharging you for things for no reason.

I buy furring strips (1x2) in bulk from a lumberyard. 

When you say trader, what comes to your mind, a stock trader or a fur trader, lol?

A few years back, I was almost certain I discovered a Frank Furness until the circa 1880 building permit indicated a Furness firm design by Tacker and Deckett.

Many times there is very little cavity in the wall as they are just furred out and the ledger boards at the top of each wall are solid for maybe 12" requiring a big hassle to cut to get wires between floors.