This includes running the plumbing and drain, installing a 220v outlet and air vent.

I'm sort of a new member here (been lurking for a little while) I'm active duty Air Force and a newish real estate investor on the side.

Referrals referrals referrals My number one rule is whenever an agent is giving me an ARV they must be able to tell you WHY.Without the "why" it's just hot air

They get some days, but did not really seem impressed with the whole air bnb deal.

now, the HOA should also have (sometimes really hidden in the papers or completely forgotten and never distributed to owners) a Minimum sound reduction index per building/multifamily.you need to beat that.what's next depends if the builder managed to secure/nail the plywood sub-floor into the joists and NOT INTO THIN AIR...so you may need 6mm cork glued, some whisperquiet/sound barrier (3-6 mm) , then you wood floor/laminate. some laminates comes with pad included.... also may need to adjust you doors/threshold and live enough space at walls for material to expand.short version: find the minimum requirements for the sound index for flooring, choose your material colors, go to the floor store in your area (floor and decor, century tile, lumber liquidators, menards, home depot, etc etc) and check with a knowledgeable associate. if not you need to talk with a contractor working in your area...tip: get to talk with your building engineer/maintenance people. they inspect the work so they/him should know what works and what not, and (key) where you can buy it quicker/cheaper!!!

@Logan Hicks... but at the end of the day, you've still planted a grass species in an aired, semi-desert environment to which it is unsuited and would never occur naturally.Ultimately, Mother Nature shall prevail ... 

Number may be closer to %30   not the %34-%39 shown at the bottom6 plex BUILDING PERMITS   (  $97,200.00  single $16,200.00 UTILITIES $0.00 $500.00 EXCAVATION $24,000.00 $4,000.00 GRAVEL $2,500.00 $416.67 CONCRETE PUMP $1,750.00 $250.00 CONCRETE $18,000.00 $3,000.00 FOUNDATION/CONCRETE-LABOR $9,000.00 $1,500.00 CONCRETE CUTTING $750.00 $125.00 SEWER CONCRETE FLAT WORK $12,000.00 $2,000.00 FRAMING LABOR $21,000.00 $4,947.00 ROOF TRUSSES $14,300.00 $1,831.67 BUILDING MATERIALS $70,000.00 $19,128.40 WINDOWS & SKYLIGHTS $8,500.00 $1,419.38 EXTERIOR DOORS $5,400.00 $1,050.00 ROOF COVER $16,800.00 $2,800.00 GAS FIREPLACE $6,000.00 SIDING LABOR $13,115.00 $2,185.00 GARAGE DOOR $4,914.00 $819.00 GUTTERS $2,400.00 $525.00 PLUMBING $30,000.00 $7,000.00 HEATING $30,000.00 $4,800.00 AIR CONDITIONING $0.00 NEST THERMOSTAT $325.00 GAS BBQ GAS DRYER ELECTRICAL $21,000.00 $4,000.00 MASONRY $3,000.00 $500.00 INSULATION $12,000.00 $2,735.00 SHEET ROCK $21,000.00 $7,100.00 SHEET ROCK GYP BOARD $750.00 INTERIOR TRIM $16,500.00 $2,500.00 TRIM LABOR $12,000.00 $2,500.00 SECURITY SYSTEM $900.00 FINISH HARDWARE $2,400.00 $350.00 UNDERLAY LABOR $1,500.00 $250.00 CABINETS $24,000.00 $4,854.40 COUNTERTOPS $11,100.00 $1,850.00 MANTLE $1,200.00 TILE $9,000.00 $1,597.80 VINYL AND FORMICA $3,000.00 $207.43 HARDWOOD FLOORS $6,600.00 $1,138.10 CARPET $13,000.00 $2,110.10 PAINTING $25,200.00 $5,359.25 WATERPROOF DECK $0.00 $0.00 KITCHEN APPLIANCES $8,400.00 $1,400.00 LIGHTS $3,000.00 $500.00 SHOWER DOOR &MIRRORS $3,000.00 $790.00 FINAL CLEANING $2,400.00 $400.00 PICK UP.

Are there air leaks around the windows and this is an attempt to stop the leaks?

Plus they tend to be clueless about air filters and basic maintenance.  

It also creates a more air tight structure throughout the home because the vapour retarder can be continuous at the floor structure.