If you concentrate on building smaller buildings with a more even return investment ratio in most cases you will be able to fit more of them on your street to equal a greater income or at the very least in equal income with a short return wait. The "Green House" and "City Center Cottage" in one day return 100% of their investment cost meaning you can build faster without losing any money.
If you tired of building 500 little houses then consider building building a "Nova Tower Block" costing 300k and returning 270K or 90% of your investment in a single day(Can also be applied to all other buildings between 150k-500k with only a small difference in return rates).