We are a small (110 unit) townhouse community around a lake in north Florida. I have lived here for three years and we have had three lawn services. (hold on, don't stone me yet

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The company that we have now is great, but the contract that we have is not specific enough in terms of work to be carried out. This is leading to different expectations of what our lawn service should do- residents expect one thing, the contract states another thing and our covenants & restrictions say something else.
I am the new pres and we have a small, cohesive board now that is trying to professionalize the way the association is being run. The current "contract" with the lawn service is open-ended. I would like to develop a two-year contract for the lawn service so that the owner can have some kind of a business plan. We are giving him an area in our secured storage to put a shed, keep a small trailer, pinestraw, etc.
Where we need help is in the details of what work will be carried out. Right now the owner and his crew are going above and beyond to do what every neighbor wants done. It is a new business and he is tap dancing to keep everyone happy. The board has told him that he doesn't need to do this, but that is the way he is. We don't want him to burn out and we want him to receive fair compensation for his work. We have mandated that residents are to contact a designated board member with lawncare issues, NOT approach the lawn service while they are working.
We'd like the contract to include specifics of the work to be carried out- ie- common areas, private property; shrubs trimmed, those dirt circles around trees kept free of weeds (I'm horticulturally disabled), etc.. We are responsible for maintaining the landscaping, but some neighbors have a freakin Biltmore garden in their yard. How to word issues like- if you want special mulch, it's your responsibility, you are responsible for flower beds. If someone has statuary in their yards, is it a major time consumer to edge around them? If so, how to exclude? DECKS BLOWN OFF- some want it done, others don't. This is not our responsibility, but some long-time elderly owners want it- any ideas how to handle?
For those with the Biltmore gardens in their yards, is it wise/feasible for the lawnservice to provide additional custom work for a separate fee? Would that be a management nightmare for him? Would it be fair to ask that the custom work be done on a day when the routine work is not carried out?
We are a working class development, but do not want the lowest bid. We want to build a long-term partnership with our lawn service and keep residents happy.
Any and all input is most welcomed.