The remaining 40% of my net income is sufficient for my regular lifestyle expenses.I also own an investment property which has 140k mortgage; rental income $1700/month; current appraised value 270k.So, as a single person filing taxes, my total mortgage amount spread across both properties is 860k.I have a brokerage investment account with a sprinkling of stocks/mutual funds valued at 100k.

Would an aerial antenna paired with good internet service and smart TVs be sufficient?

Not sure why throwing owner occupied-s in there is a good strategy when they’re usually just upset and demand the highest price (unless you’re doing sub 2 and not all cash).I don’t think it’s a quantity issue either.

@Vic DelgadoDifficult to say without looking at a buildings financials, but that being said it's possible to approximate using public data.I first pull the Cleveland parcel data-set from the Cuyahoga County Open Data website.I then filtered down by number of dwelling units greater than or equal to 5 and with a recorded transfer of ownership in  Jan 2018 or laterThe reason I chose 5 unit is because the number of buildings with 100 or more units is very small, and we need a sufficient sample size to get meaningful results. 

Is it necessary to have the smoke alarm connected to a central system or is a regular smoke alarm sufficient ?

Our LTV% across all our properties was sufficient.  

When evaluating a property for a single family then I just get comps and get the rent rates and do the math to determine if sufficient cash flow.  

If it were month to month, you could cancel it at any time with sufficient notice.

You want to be prudent and have sufficient reserve funds, but you don't want to tie up extra money in the property that you don't need to.

Appreciation (or lack of appreciation) is a symptom of long-term underlying economic conditions like job quality and quantity, location desirability, population growth, etc.