@Daniel Lozowy
One of the main points to consider is that not all returns are created equal. @Brian Burke mentioned one of the key phrases, “risk adjusted returns”.
A 25% IRR multifamily development deal is not necessarily better than a 6% IRR NNN Walgreens 10/31 deal. The reason one deal pays more than the other is due to the risk/reward trade off as perceived by the market. The 6% Walgreens backed by a corporate guarantee with an investment grade rating (high credit score for businesses) gives a high probably that they will continue to pay their lease even if they close the store. The income is more certain so the returns go down by way of interested parties driving the price up, just like US treasury bonds.
New investors will often just look at stated or projected returns and not the entire return profile. Sophisticated investors looking for an efficient and diversified real estate portion of their portfolio will have a mixture of higher risk - higher return deals and also lower risk-lower return deals.
Without going into much detail, time horizon can also greatly skew IRR one way or another.
Point is, there are lots of ways to earn 10-15%. Does it match your investment goals and objectives, time horizon, and is it a good fit for your portfolio are questions only you can answer (with the help of your trusted advisors).