Live frugally, below your means, save as much as possible (invest in an index fund), until you have the cash available to do it right. 

I am a financial independence "enthusiast" if you will and always interested in adding more semi-"passive" incomes streams to supplement my current investment portfolio (mainly index funds at the moment).

I have been contemplating whether to place capital into a savings account and/or investing into an S&P 500 index fund, until I find the next investment opportunity. 

I am torn between something safe (traditional/high interest savings acct.) vs. opening up a Vanguard Index and withdrawing the necessary amount when needed.

The index everyone tracks is 20% down, loan amount below $453k, sfr, owner occ, 0.5 to 1 point, FICO>740.

yea we have alot of money in low cost index funds as of now. they work great in between saving for a property with cash.I've though about leverage but between the p and I cap ex maitnance vacancy and all the other stuff it is cheaper to buy the condo with cash then up and sell it when I can buy the duplex. taxes are high here for homes on there own lot the condo is closer to 1 percent property taxes were as single family homes and duplexes and such are closer to 2 percent to 2.2 percent so that is a big reason why it makes more sense as of now.yea just this first duplex I want to pay cash for. after that I have no problem with leverage. but if we live in it it's gotta be paid for it creates a very stable rock so if the wind blows hard I am protected and have no worrysit really helps ease my anxiaty disorder and will prevent a stroke at a early age. a large reason as well is we cant qualify for a morgage that large.

Just invest in an mutual or index fund (like Fidelity Freedom 2035). 

After listening to Mindy Jensen and Scott Trench's recent episode with Index Fund Guy, index funds are starting to look VERY attractive.  

Hi,I have 50K extra to invest, and I have already diversified my other investments to many different areas using: Vanguard 3-fund index fund portfolio ( vtsax, vtiax, vwitx (60/30/10) ), M1Finance 3-fund ETF portfolio ( vti, vxus, vteb (60/30/10), individual company stocks and ESPP (around 80K), Treasury notes (6-month and 1-year, total of 40K), I-bonds (10K limit for this year), some CDs (1-year 2% at ally and synchrony), and some in savings account in synchrony.How can i invest the extra 50K?

If you are at market you need to do a rent increase annually to keep up with the annual cost of living index/increased expenses.