Technically, under this scenario, the vent does not appear to constitute a "structural" change, it may also not constitute a change to the exterior (it depends on what the HOA guidelines say), most of the time an exterior change has to do with adding/deleting doors, windows, and changing the  facade and color.   

Unit is in good overall condition, one interior door is damage, and a few small holes - $32K MLS-2180280482123 Dawnlight Ave - 2 BR Flat - Rented $615/month - Great condition, home has been converted to baseboard heat.

The house is semi staged and has a random coffee table in a completely empty room, sofas in the living room are placed in the middle of the room which cuts the room in half and the garage and barn just have clutter.

You also have to look at the whole picture...how much are taxes in that state, are utilities insane, what can my average rents be per door, what is crime in the area like, etc.

I generally shoot for $100 cashflow per month PER DOOR. 

On the same street you could have a 1200 SF one story hip roof house with a detached garage needing a roof replacement.

I look for $150 per door after i move out in net profit each month.

Hard work man...Calling your sphere, call arounds for other listings, door knocking, open houses, networking events, social media, forums like these, etc etc. 

Lets take a quick look at the numbers on the house hack duplex:Purchase price: $160,000Renovation budget: $21,000ARV: $215,000 Rents: First floor: $1,250 before being fixed up, but i am occupying and its already fixed up.Second floor: $850Three garage bays: $95/each Total expenses after re-fi (PITI): $1,815 (NJ taxes are unreal!)

I want to spend less than $3,000 on inspections and closing costs I want to spend less than $20,000 in initial repairs and rehab Schools above 6 rating Tenants pay all utilities Ideally: Rent 1% or more of ARV Ideally:10-12%+ CoC ROIIdeally: I want minimum 100+ monthly cash flow or 100/door after ALL expensesWhen possible, I want to purchase multifamily units (2-4, max 8)Values we use in our calculations: 5.5% interest rate, 30 years, 25% DP 10% vacancy 6% repairs and maintenance 6% capital expenditures 10% management fees 2% annual income growth 2% annual appreciation growth 2% annual expenses growth 6% sales/exit expenses