编辑同志:我们是某花园的住户。最近,一楼住户在装修过程中,纷纷将门前绿地改造成水泥地面。楼上住户对其改造行为进行阻止时,一楼住户以在购房时开发商就已承诺,一楼门前的绿地属于一楼住户为由,不听劝阻仍然继续施工。请问:一楼住户能否擅自改造门前绿地? Editor's comrade: We are a garden resident. Recently, the first floor tenants in the renovation process, have transformed the green space in front of the concrete floor. Upstairs residents to prevent the reform act, the first floor of the tenants in the purchase of real estate developers have promised, in front of the ground floor of the first floor of green belonged to the ground, do not listen to discourage still continue construction. Excuse me: can the first floor tenants make unauthorized alterations in front of the green space?