It's good to sell my rental CF about $250/Mon

[Sal Zafar]

Hi just wanted to see how other think on the scenario.
If someone has 4 rental properties in good B class neighborhood. Is it a good good idea to sell them off now and reinvest into smaller $40k to $50k free and clear older houses  (obviously bit far) and collect ~$600 per house or hold on to them for ~$250 month CF and sell them in next 10 years?

Knowing everyone has d/f situation, but increasing in property tax shrinking monthly CF in good B class areas-- which makes me ask this question. 

Thanks
Sal