[Highland Park] Looking to buy/rent/borrow stroller

We are looking for a stroller to buy/rent/borrow for a couple of trips before the end of summer. Our 42 lb 4 year old still uses an umbrella stroller occasionally, but our basic umbrella stroller will probably bite the dust if we push it for a week of sightseeing. If you have a heavier duty stroller that can carry a heavier child that you are thinking about parting with (if only temporarily), please let me know!