Mexico City duplex snapshot: -5.2% movement and service charges

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First-time buyer
I need to work out whether this snapshot is reliable before using it to judge an offer. The Mexico City duplexes are advertised between MX$3,312,000 and MX$4,968,000, with a recorded movement of -5.2% and a median marketing period near 49 days. The difficulty is that condition varies enough to distort a simple average.

Service charges add another layer. A recurring building cost may lead one buyer to lower an offer and another to reject the property because the total monthly commitment no longer works with their financing. I plan to separate those charges from one-off transaction costs, then compare the timing of price cuts with recent completed sales, withdrawals and relistings. Would that give a clearer picture than the advertised stock alone?
 
First establish what each service charge actually covers and whether it is recurring or one-off. If it is a building-level charge the seller cannot change, the buyer’s response may be a lower offer rather than negotiation over the charge itself. Some will just walk if the total monthly cost looks poor beside nearby alternatives. How tightly have you drawn the neighbourhood boundaries?
 
That is probably where my sample needs work. I grouped properties by broad location and price, but condition and neighbourhood boundaries may be obscuring more than the median reveals. I’ll separate recurring charges from anything transaction-related, then compare completed sales with active, withdrawn and relisted stock. That should also show whether the -5.2% is meaningful or just a change in the mix.
 
I’d still be cautious about interpreting 49 days or the price movement after that split. Withdrawals can make marketing times look shorter, and a renovated duplex may behave very differently from one needing work. Price-cut timing could be more revealing: did sellers reduce before receiving serious interest, or only after financing problems or a failed negotiation? Service charges may be blamed when condition or buyer financing was the real obstacle.
 
A practical comparison would pair similar properties within the same neighbourhood, then record condition, service charge, first price, cut date, final status and seller motivation where known. New-listing volume matters too: buyers are more willing to move on when substitutes keep appearing. Without that context, a high charge and a motivated seller can produce a very different outcome from the same charge on a scarce property.
 
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