Why I Chose My Major

My interest in real estate can be traced back to the time when I helped my mom to manage one of her properties. The building (with both residential and commercial options) was primarily intended be used as rental property for investment purpose. In the course of managing over more than 30 thirty apartment units, I saw firsthand how well-organized property management can increases the value of a property., and hence increases its price [画蛇添足]. Actually, this property was later sold to a second-hand buyer with a very decent profit.  price and this It was the time then that I come to recognize realized the its [here, "its" is taken to mean well management] importance of the professional property management to the inner value of the real estate. Since then, my interest for real estate runs grew deeper and deeper through and began to provide better providing quality services for our to tenants, be it through such as offering free Wi-Fi access, easy access to adding  washer and dryer, or an even providing 24 hour security., and As a result, I seeing more people move in an increase of tenants. Indeed, it is through this combination of these experiences that I have come to realize my life's ambition: to dedicate my life to the real estate industry. [In the US, the real estate industry refers to the buying and selling or real property.  They do not provide any other service that does not relate to the transfer of ownership from one to another.  Property Management includes the kinds of services you mentioned.] and I hope I [without these two words, your conclusion is not appropriate or make sense.  It is called a dangling conclusion.]will be able to offers my expertise in global property markets with my professional experience and market knowledge.

Your English is good.  Better than most from your country.  Good work.  In time, your writing needs no correction except for minor errors and wrong use in the mechanics of the language which I assume you did not know or learnt wrongly.  For example, use of comma before conjunctions.

Why I Chose My Major

My interest in real estate can be traced back to the time when I helped my mom to manage one of her properties. The building (with both residential and commercial options) was primarily intended be used as rental property for investment purposes. In the course of managing more than 30 apartment units, I saw firsthand how well-organized property management can increases the value of a property and hence increases its price. Actually, this property was later sold to a second-hand buyer with a very decent price and this was the time that I come to recognize the importance of the professional property management to the inner value of the real estate. Since then, my interest for real estate runs deeper and deeper through providing quality services for our tenants, be it through offering free Wi-Fi access, adding washer and dryer, or providing 24 hour security and seeing more people move in. Indeed, it is through this combination of experiences that I have come to realize my life's ambition: to dedicate my life to real estate industry and I will be able to offers my expertise in global property markets with my professional experience and market knowledge.

[Your English is excellent.  You don't put a comma before 'and' - small error]